diff --git a/docs/markdown/contribution.zh-CN.md b/docs/markdown/contribution.zh-CN.md
index 521df3677..ebdc6e822 100644
--- a/docs/markdown/contribution.zh-CN.md
+++ b/docs/markdown/contribution.zh-CN.md
@@ -141,4 +141,4 @@ export default create({
 
 #### 样式
 
-组件样式使用 `precss 2.0` 作为预处理器，具体语法请参考 [precss 文档](https://github.com/jonathantneal/precss).
+组件样式使用 `precss 3.0` 作为预处理器，具体语法请参考 [precss 文档](https://github.com/jonathantneal/precss).
diff --git a/docs/markdown/theme.zh-CN.md b/docs/markdown/theme.zh-CN.md
index 37140e35d..cfdccdac2 100644
--- a/docs/markdown/theme.zh-CN.md
+++ b/docs/markdown/theme.zh-CN.md
@@ -19,9 +19,6 @@ import 'vant/packages/vant-css/src/checkbox.css';
 ```javascript
 module.exports = {
   plugins: [
-    require('postcss-easy-import')({
-      extensions: ['pcss', 'css']
-    }),
     require('postcss-theme-variables')({
       vars: {
         red: '#F60',
@@ -39,8 +36,6 @@ module.exports = {
 };
 ```
 
-> 注意: precss2 和 3 版本不兼容, 请将precss的版本改为2.0.0
-
 ### 方案二. 本地构建
 可以通过在本地构建 vant-css 的方式生成所需的主题
 
@@ -54,4 +49,3 @@ cd packages/vant-css
 ```bash
 npm run build
 ```
-
diff --git a/package.json b/package.json
index 310777557..cf2729136 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
   "devDependencies": {
     "@vue/server-test-utils": "^1.0.0-beta.24",
     "@vue/test-utils": "^1.0.0-beta.24",
-    "autoprefixer": "^9.1.2",
+    "autoprefixer": "^9.1.3",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.3",
     "babel-jest": "^23.4.2",
@@ -89,9 +89,8 @@
     "md5-file": "^4.0.0",
     "postcss": "^7.0.2",
     "postcss-calc": "^6.0.0",
-    "postcss-easy-import": "^3.0.0",
     "postcss-loader": "^3.0.0",
-    "precss": "2.0.0",
+    "precss": "3.1.2",
     "progress-bar-webpack-plugin": "^1.11.0",
     "rimraf": "^2.5.4",
     "shelljs": "^0.8.1",
@@ -101,16 +100,16 @@
     "stylelint-config-standard": "^18.2.0",
     "uppercamelcase": "^3.0.0",
     "url-loader": "^1.1.1",
-    "vant-doc": "1.0.14",
+    "vant-doc": "1.0.15",
     "vue": "2.5.17",
     "vue-jest": "^2.6.0",
-    "vue-loader": "^15.4.0",
+    "vue-loader": "^15.4.1",
     "vue-router": "^3.0.1",
     "vue-server-renderer": "^2.5.17",
     "vue-sfc-compiler": "^0.0.8",
     "vue-template-compiler": "2.5.17",
     "vue-template-es2015-compiler": "^1.6.0",
-    "webpack": "^4.16.5",
+    "webpack": "^4.17.1",
     "webpack-cli": "^3.1.0",
     "webpack-serve": "^2.0.2"
   }
diff --git a/packages/vant-css/package.json b/packages/vant-css/package.json
index af6a27e14..d32e1643b 100644
--- a/packages/vant-css/package.json
+++ b/packages/vant-css/package.json
@@ -13,14 +13,13 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "autoprefixer": "^8.3.0",
-    "fs-extra": "^6.0.1",
+    "autoprefixer": "^9.1.3",
+    "fs-extra": "^7.0.0",
     "gulp": "^3.9.1",
-    "gulp-clean-css": "^3.9.0",
-    "gulp-postcss": "^7.0.0",
+    "gulp-clean-css": "^3.10.0",
+    "gulp-postcss": "^8.0.0",
     "postcss-calc": "^6.0.1",
-    "postcss-easy-import": "^3.0.0",
     "postcss-theme-variables": "^1.0.0",
-    "precss": "^2.0.0"
+    "precss": "^3.1.2"
   }
 }
diff --git a/packages/vant-css/src/card.css b/packages/vant-css/src/card.css
index 67063a76a..132c0cf8a 100644
--- a/packages/vant-css/src/card.css
+++ b/packages/vant-css/src/card.css
@@ -58,7 +58,7 @@
   &__title {
     max-height: 40px;
 
-    @mixin multi-ellipsis 2;
+    @include multi-ellipsis(2);
   }
 
   &__desc {
@@ -66,7 +66,7 @@
     font-size: 12px;
     max-height: 20px;
 
-    @mixin ellipsis;
+    @include ellipsis;
   }
 
   &__price,
diff --git a/packages/vant-css/src/common/clearfix.css b/packages/vant-css/src/common/clearfix.css
index 10af7aa81..f8d17290b 100644
--- a/packages/vant-css/src/common/clearfix.css
+++ b/packages/vant-css/src/common/clearfix.css
@@ -1,5 +1,5 @@
 @import '../mixins/clearfix.css';
 
 .van-clearfix {
-  @mixin clearfix;
+  @include clearfix;
 }
diff --git a/packages/vant-css/src/common/ellipsis.css b/packages/vant-css/src/common/ellipsis.css
index b7e70beee..1c4671014 100644
--- a/packages/vant-css/src/common/ellipsis.css
+++ b/packages/vant-css/src/common/ellipsis.css
@@ -1,5 +1,5 @@
 @import '../mixins/ellipsis.css';
 
 .van-ellipsis {
-  @mixin ellipsis;
+  @include ellipsis;
 }
diff --git a/packages/vant-css/src/common/hairline.css b/packages/vant-css/src/common/hairline.css
index 14edde08e..c2bff1395 100644
--- a/packages/vant-css/src/common/hairline.css
+++ b/packages/vant-css/src/common/hairline.css
@@ -1,10 +1,10 @@
-@import "../mixins/border-retina.css";
+@import "../mixins/hairline.css";
 
 [class*='van-hairline'] {
   position: relative;
 
   &::after {
-    @mixin hairline;
+    @include hairline;
   }
 }
 
diff --git a/packages/vant-css/src/coupon-list.css b/packages/vant-css/src/coupon-list.css
index f862fb85b..7aeb3de15 100644
--- a/packages/vant-css/src/coupon-list.css
+++ b/packages/vant-css/src/coupon-list.css
@@ -70,7 +70,7 @@
     h2 {
       margin: 0;
 
-      @mixin ellipsis;
+      @include ellipsis;
     }
 
     h2 {
diff --git a/packages/vant-css/src/mixins/border-retina.css b/packages/vant-css/src/mixins/border-retina.css
deleted file mode 100644
index 1474e4c0f..000000000
--- a/packages/vant-css/src/mixins/border-retina.css
+++ /dev/null
@@ -1,34 +0,0 @@
-@import '../common/var.css';
-
-$border-poses: top, right, bottom, left;
-
-@define-mixin border-retina $poses: $border-poses, $border-retina-color: $border-color {
-  content: '';
-  position: absolute;
-  top: 0;
-  left: 0;
-  width: 200%;
-  height: 200%;
-  transform: scale(.5);
-  transform-origin: 0 0;
-  pointer-events: none;
-  box-sizing: border-box;
-
-  @each $pos in $poses {
-    border-$(pos): 1px solid $border-retina-color;
-  }
-}
-
-@define-mixin hairline $border-retina-color: $border-color {
-  content: '';
-  position: absolute;
-  top: 0;
-  left: 0;
-  width: 200%;
-  height: 200%;
-  transform: scale(.5);
-  transform-origin: 0 0;
-  pointer-events: none;
-  box-sizing: border-box;
-  border: 0 solid $border-retina-color;
-}
diff --git a/packages/vant-css/src/mixins/clearfix.css b/packages/vant-css/src/mixins/clearfix.css
index cb8ed0126..030d78a52 100644
--- a/packages/vant-css/src/mixins/clearfix.css
+++ b/packages/vant-css/src/mixins/clearfix.css
@@ -1,4 +1,4 @@
-@define-mixin clearfix {
+@mixin clearfix {
   &::after {
     content: '';
     display: table;
diff --git a/packages/vant-css/src/mixins/ellipsis.css b/packages/vant-css/src/mixins/ellipsis.css
index e57f1060c..4b196e0a5 100644
--- a/packages/vant-css/src/mixins/ellipsis.css
+++ b/packages/vant-css/src/mixins/ellipsis.css
@@ -1,13 +1,13 @@
-@define-mixin multi-ellipsis $lines {
-  overflow : hidden;
+@mixin multi-ellipsis($lines) {
+  overflow: hidden;
   text-overflow: ellipsis;
   display: -webkit-box;
   -webkit-line-clamp: $lines;
   -webkit-box-orient: vertical;
 }
 
-@define-mixin ellipsis {
-    overflow: hidden;
-    white-space: nowrap;
-    text-overflow: ellipsis;
-}
\ No newline at end of file
+@mixin ellipsis {
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+}
diff --git a/packages/vant-css/src/mixins/hairline.css b/packages/vant-css/src/mixins/hairline.css
new file mode 100644
index 000000000..81949784a
--- /dev/null
+++ b/packages/vant-css/src/mixins/hairline.css
@@ -0,0 +1,13 @@
+@mixin hairline($border-color: #e5e5e5) {
+  content: '';
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 200%;
+  height: 200%;
+  transform: scale(0.5);
+  transform-origin: 0 0;
+  pointer-events: none;
+  box-sizing: border-box;
+  border: 0 solid $border-color;
+}
diff --git a/packages/vant-css/yarn.lock b/packages/vant-css/yarn.lock
index 3fa4e4eea..534a5fa48 100644
--- a/packages/vant-css/yarn.lock
+++ b/packages/vant-css/yarn.lock
@@ -2,6 +2,21 @@
 # yarn lockfile v1
 
 
+"@csstools/convert-colors@^1.4.0":
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/@csstools/convert-colors/-/convert-colors-1.4.0.tgz#ad495dc41b12e75d588c6db8b9834f08fa131eb7"
+
+"@csstools/postcss-image-set-function@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@csstools/postcss-image-set-function/-/postcss-image-set-function-1.0.0.tgz#1ef0913d90a9c4440495eb41624c202e53a703f3"
+  dependencies:
+    postcss "^6.0.20"
+    postcss-value-parser "^3.3.0"
+
+"@csstools/sass-import-resolve@^1":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@csstools/sass-import-resolve/-/sass-import-resolve-1.0.0.tgz#32c3cdb2f7af3cd8f0dca357b592e7271f3831b5"
+
 abbrev@1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
@@ -12,24 +27,12 @@ ansi-colors@^1.0.1:
   dependencies:
     ansi-wrap "^0.1.0"
 
-ansi-cyan@^0.1.1:
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/ansi-cyan/-/ansi-cyan-0.1.1.tgz#538ae528af8982f28ae30d86f2f17456d2609873"
-  dependencies:
-    ansi-wrap "0.1.0"
-
 ansi-gray@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/ansi-gray/-/ansi-gray-0.1.1.tgz#2962cf54ec9792c48510a3deb524436861ef7251"
   dependencies:
     ansi-wrap "0.1.0"
 
-ansi-red@^0.1.1:
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/ansi-red/-/ansi-red-0.1.1.tgz#8c638f9d1080800a353c9c28c8a81ca4705d946c"
-  dependencies:
-    ansi-wrap "0.1.0"
-
 ansi-regex@^2.0.0:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df"
@@ -80,13 +83,6 @@ argparse@^1.0.7:
   dependencies:
     sprintf-js "~1.0.2"
 
-arr-diff@^1.0.1:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/arr-diff/-/arr-diff-1.1.0.tgz#687c32758163588fef7de7b36fabe495eb1a399a"
-  dependencies:
-    arr-flatten "^1.0.1"
-    array-slice "^0.2.3"
-
 arr-diff@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/arr-diff/-/arr-diff-2.0.0.tgz#8f3b827f955a8bd669697e4a4256ac3ceae356cf"
@@ -101,10 +97,6 @@ arr-flatten@^1.0.1, arr-flatten@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/arr-flatten/-/arr-flatten-1.1.0.tgz#36048bbff4e7b47e136644316c99669ea5ae91f1"
 
-arr-union@^2.0.1:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/arr-union/-/arr-union-2.1.0.tgz#20f9eab5ec70f5c7d215b1077b1c39161d292c7d"
-
 arr-union@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/arr-union/-/arr-union-3.1.0.tgz#e39b09aea9def866a8f206e288af63919bae39c4"
@@ -117,21 +109,11 @@ array-each@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/array-each/-/array-each-1.0.1.tgz#a794af0c05ab1752846ee753a1f211a05ba0c44f"
 
-array-slice@^0.2.3:
-  version "0.2.3"
-  resolved "https://registry.yarnpkg.com/array-slice/-/array-slice-0.2.3.tgz#dd3cfb80ed7973a75117cdac69b0b99ec86186f5"
-
 array-slice@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/array-slice/-/array-slice-1.1.0.tgz#e368ea15f89bc7069f7ffb89aec3a6c7d4ac22d4"
 
-array-union@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/array-union/-/array-union-1.0.2.tgz#9a34410e4f4e3da23dea375be5be70f24778ec39"
-  dependencies:
-    array-uniq "^1.0.1"
-
-array-uniq@^1.0.1, array-uniq@^1.0.2:
+array-uniq@^1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/array-uniq/-/array-uniq-1.0.3.tgz#af6ac877a25cc7f74e058894753858dfdb24fdb6"
 
@@ -155,15 +137,15 @@ atob@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.0.tgz#ab2b150e51d7b122b9efc8d7340c06b6c41076bc"
 
-autoprefixer@^8.3.0:
-  version "8.3.0"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-8.3.0.tgz#22ac5151c3c8946bb8f75f337d5c5042c0ec6404"
+autoprefixer@^9.1.3:
+  version "9.1.3"
+  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.1.3.tgz#bd5940ccb9d1bfa3508308659915f0a14394c8d5"
   dependencies:
-    browserslist "^3.2.4"
-    caniuse-lite "^1.0.30000830"
+    browserslist "^4.0.2"
+    caniuse-lite "^1.0.30000878"
     normalize-range "^0.1.2"
     num2fraction "^1.2.2"
-    postcss "^6.0.21"
+    postcss "^7.0.2"
     postcss-value-parser "^3.2.3"
 
 babel-cli@^6.26.0:
@@ -265,7 +247,7 @@ babel-register@^6.26.0:
     mkdirp "^0.5.1"
     source-map-support "^0.4.15"
 
-babel-runtime@^6.22.0, babel-runtime@^6.26.0:
+babel-runtime@^6.22.0, babel-runtime@^6.23.0, babel-runtime@^6.26.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-runtime/-/babel-runtime-6.26.0.tgz#965c7058668e82b55d7bfe04ff2337bc8b5647fe"
   dependencies:
@@ -309,10 +291,6 @@ babylon@^6.18.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.18.0.tgz#af2f3b88fa6f5c1e4c634d1a0f8eac4f55b395e3"
 
-balanced-match@0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-0.1.0.tgz#b504bd05869b39259dd0c5efc35d843176dccc4a"
-
 balanced-match@^0.4.2:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-0.4.2.tgz#cb3f3e3c732dc0f01ee70b403f302e61d7709838"
@@ -378,6 +356,14 @@ browserslist@^3.2.4:
     caniuse-lite "^1.0.30000830"
     electron-to-chromium "^1.3.42"
 
+browserslist@^4.0.2:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.1.0.tgz#81cbb8e52dfa09918f93c6e051d779cb7360785d"
+  dependencies:
+    caniuse-lite "^1.0.30000878"
+    electron-to-chromium "^1.3.61"
+    node-releases "^1.0.0-alpha.11"
+
 cache-base@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/cache-base/-/cache-base-1.0.1.tgz#0a7f46416831c8b662ee36fe4e7c59d76f666ab2"
@@ -392,9 +378,9 @@ cache-base@^1.0.1:
     union-value "^1.0.0"
     unset-value "^1.0.0"
 
-camelcase-css@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/camelcase-css/-/camelcase-css-1.0.1.tgz#157c4238265f5cf94a1dffde86446552cbf3f705"
+caniuse-lite@^1.0.30000823, caniuse-lite@^1.0.30000878:
+  version "1.0.30000878"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000878.tgz#c644c39588dd42d3498e952234c372e5a40a4123"
 
 caniuse-lite@^1.0.30000830:
   version "1.0.30000830"
@@ -418,6 +404,14 @@ chalk@^2.3.2:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
+chalk@^2.4.1:
+  version "2.4.1"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
+  dependencies:
+    ansi-styles "^3.2.1"
+    escape-string-regexp "^1.0.5"
+    supports-color "^5.3.0"
+
 chokidar@^1.6.1:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-1.7.0.tgz#798e689778151c8076b4b360e5edd28cda2bb468"
@@ -446,11 +440,11 @@ class-utils@^0.3.5:
     isobject "^3.0.0"
     static-extend "^0.1.1"
 
-clean-css@4.1.11:
-  version "4.1.11"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.11.tgz#2ecdf145aba38f54740f26cefd0ff3e03e125d6a"
+clean-css@4.2.1:
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.2.1.tgz#2d411ef76b8569b6d0c84068dabe85b0aa5e5c17"
   dependencies:
-    source-map "0.5.x"
+    source-map "~0.6.0"
 
 clone-stats@^0.0.1:
   version "0.0.1"
@@ -475,33 +469,43 @@ collection-visit@^1.0.0:
     map-visit "^1.0.0"
     object-visit "^1.0.0"
 
-color-convert@^1.3.0, color-convert@^1.9.0:
+color-convert@^1.8.2:
+  version "1.9.2"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.2.tgz#49881b8fba67df12a96bdf3f56c0aab9e7913147"
+  dependencies:
+    color-name "1.1.1"
+
+color-convert@^1.9.0:
   version "1.9.1"
   resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.1.tgz#c1261107aeb2f294ebffec9ed9ecad529a6097ed"
   dependencies:
     color-name "^1.1.1"
 
+color-name@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.1.tgz#4b1415304cf50028ea81643643bd82ea05803689"
+
 color-name@^1.0.0, color-name@^1.1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
 
-color-string@^0.3.0:
-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/color-string/-/color-string-0.3.0.tgz#27d46fb67025c5c2fa25993bfbf579e47841b991"
+color-string@^1.4.0:
+  version "1.5.3"
+  resolved "https://registry.yarnpkg.com/color-string/-/color-string-1.5.3.tgz#c9bbc5f01b58b5492f3d6857459cb6590ce204cc"
   dependencies:
     color-name "^1.0.0"
+    simple-swizzle "^0.2.2"
 
 color-support@^1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-support/-/color-support-1.1.3.tgz#93834379a1cc9a0c61f82f52f0d04322251bd5a2"
 
-color@^0.11.0:
-  version "0.11.4"
-  resolved "https://registry.yarnpkg.com/color/-/color-0.11.4.tgz#6d7b5c74fb65e841cd48792ad1ed5e07b904d764"
+color@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/color/-/color-1.0.3.tgz#e48e832d85f14ef694fb468811c2d5cfe729b55d"
   dependencies:
-    clone "^1.0.2"
-    color-convert "^1.3.0"
-    color-string "^0.3.0"
+    color-convert "^1.8.2"
+    color-string "^1.4.0"
 
 commander@^2.11.0:
   version "2.16.0"
@@ -535,31 +539,23 @@ core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
-cosmiconfig@^2.1.0, cosmiconfig@^2.1.1:
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/cosmiconfig/-/cosmiconfig-2.2.2.tgz#6173cebd56fac042c1f4390edf7af6c07c7cb892"
+cosmiconfig@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/cosmiconfig/-/cosmiconfig-4.0.0.tgz#760391549580bbd2df1e562bc177b13c290972dc"
   dependencies:
     is-directory "^0.3.1"
-    js-yaml "^3.4.3"
-    minimist "^1.2.0"
-    object-assign "^4.1.0"
-    os-homedir "^1.0.1"
-    parse-json "^2.2.0"
-    require-from-string "^1.1.0"
-
-css-color-function@~1.3.3:
-  version "1.3.3"
-  resolved "https://registry.yarnpkg.com/css-color-function/-/css-color-function-1.3.3.tgz#8ed24c2c0205073339fafa004bc8c141fccb282e"
-  dependencies:
-    balanced-match "0.1.0"
-    color "^0.11.0"
-    debug "^3.1.0"
-    rgb "~0.1.0"
+    js-yaml "^3.9.0"
+    parse-json "^4.0.0"
+    require-from-string "^2.0.1"
 
 css-unit-converter@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/css-unit-converter/-/css-unit-converter-1.1.1.tgz#d9b9281adcfd8ced935bdbaba83786897f64e996"
 
+cssdb@^1.6.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/cssdb/-/cssdb-1.6.0.tgz#3360c4163e07cf4d1efe58c1bc15170535f4d393"
+
 dateformat@^2.0.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/dateformat/-/dateformat-2.2.0.tgz#4065e2013cf9fb916ddfd82efb506ad4c6769062"
@@ -570,12 +566,6 @@ debug@^2.1.2, debug@^2.2.0, debug@^2.3.3, debug@^2.6.8, debug@^2.6.9:
   dependencies:
     ms "2.0.0"
 
-debug@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
-  dependencies:
-    ms "2.0.0"
-
 decode-uri-component@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/decode-uri-component/-/decode-uri-component-0.2.0.tgz#eb3913333458775cb84cd1a1fae062106bb87545"
@@ -631,6 +621,12 @@ detect-libc@^1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
 
+dot-prop@^4.1.1:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/dot-prop/-/dot-prop-4.2.0.tgz#1f19e0c2e1aa0e32797c49799f2837ac6af69c57"
+  dependencies:
+    is-obj "^1.0.0"
+
 duplexer2@0.0.2:
   version "0.0.2"
   resolved "https://registry.yarnpkg.com/duplexer2/-/duplexer2-0.0.2.tgz#c614dcf67e2fb14995a91711e5a617e8a60a31db"
@@ -641,15 +637,19 @@ electron-to-chromium@^1.3.42:
   version "1.3.42"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.42.tgz#95c33bf01d0cc405556aec899fe61fd4d76ea0f9"
 
+electron-to-chromium@^1.3.61:
+  version "1.3.61"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.61.tgz#a8ac295b28d0f03d85e37326fd16b6b6b17a1795"
+
 end-of-stream@~0.1.5:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/end-of-stream/-/end-of-stream-0.1.5.tgz#8e177206c3c80837d85632e8b9359dfe8b2f6eaf"
   dependencies:
     once "~1.3.0"
 
-error-ex@^1.2.0:
-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/error-ex/-/error-ex-1.3.1.tgz#f855a86ce61adc4e8621c3cda21e7a7612c3a8dc"
+error-ex@^1.3.1:
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/error-ex/-/error-ex-1.3.2.tgz#b4ac40648107fdcdcfae242f428bea8a14d4f1bf"
   dependencies:
     is-arrayish "^0.2.1"
 
@@ -695,12 +695,6 @@ expand-tilde@^2.0.0, expand-tilde@^2.0.2:
   dependencies:
     homedir-polyfill "^1.0.1"
 
-extend-shallow@^1.1.2:
-  version "1.1.4"
-  resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-1.1.4.tgz#19d6bf94dfc09d76ba711f39b872d21ff4dd9071"
-  dependencies:
-    kind-of "^1.1.0"
-
 extend-shallow@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-2.0.1.tgz#51af7d614ad9a9f610ea1bafbb989d6b1c56890f"
@@ -825,9 +819,9 @@ fragment-cache@^0.2.1:
   dependencies:
     map-cache "^0.2.2"
 
-fs-extra@^6.0.1:
-  version "6.0.1"
-  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-6.0.1.tgz#8abc128f7946e310135ddc93b98bddb410e7a34b"
+fs-extra@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-7.0.0.tgz#8cc3f47ce07ef7b3593a11b9fb245f7e34c041d6"
   dependencies:
     graceful-fs "^4.1.2"
     jsonfile "^4.0.0"
@@ -922,7 +916,7 @@ glob@^4.3.1:
     minimatch "^2.0.1"
     once "^1.3.0"
 
-glob@^7.0.3, glob@^7.0.5, glob@^7.1.1, glob@^7.1.2:
+glob@^7.0.5, glob@^7.1.2:
   version "7.1.2"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.2.tgz#c19c9df9a028702d678612384a6552404c636d15"
   dependencies:
@@ -963,16 +957,6 @@ globals@^9.18.0:
   version "9.18.0"
   resolved "https://registry.yarnpkg.com/globals/-/globals-9.18.0.tgz#aa3896b3e69b487f17e31ed2143d69a8e30c2d8a"
 
-globby@^6.1.0:
-  version "6.1.0"
-  resolved "https://registry.yarnpkg.com/globby/-/globby-6.1.0.tgz#f5a6d70e8395e21c858fb0489d64df02424d506c"
-  dependencies:
-    array-union "^1.0.1"
-    glob "^7.0.3"
-    object-assign "^4.0.1"
-    pify "^2.0.0"
-    pinkie-promise "^2.0.0"
-
 globule@~0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/globule/-/globule-0.1.0.tgz#d9c8edde1da79d125a151b79533b978676346ae5"
@@ -1001,23 +985,23 @@ graceful-fs@~1.2.0:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-1.2.3.tgz#15a4806a57547cb2d2dbf27f42e89a8c3451b364"
 
-gulp-clean-css@^3.9.0:
-  version "3.9.3"
-  resolved "https://registry.yarnpkg.com/gulp-clean-css/-/gulp-clean-css-3.9.3.tgz#47bf7ad62f44970f86e4ac4bdeed68ad904e65c5"
+gulp-clean-css@^3.10.0:
+  version "3.10.0"
+  resolved "https://registry.yarnpkg.com/gulp-clean-css/-/gulp-clean-css-3.10.0.tgz#bccd4605eff104bfa4980014cc4b3c24c571736d"
   dependencies:
-    clean-css "4.1.11"
+    clean-css "4.2.1"
     plugin-error "1.0.1"
     through2 "2.0.3"
     vinyl-sourcemaps-apply "0.2.1"
 
-gulp-postcss@^7.0.0:
-  version "7.0.1"
-  resolved "https://registry.yarnpkg.com/gulp-postcss/-/gulp-postcss-7.0.1.tgz#3f1c36db1197140c399c252ddff339129638e395"
+gulp-postcss@^8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/gulp-postcss/-/gulp-postcss-8.0.0.tgz#8d3772cd4d27bca55ec8cb4c8e576e3bde4dc550"
   dependencies:
     fancy-log "^1.3.2"
-    plugin-error "^0.1.2"
-    postcss "^6.0.0"
-    postcss-load-config "^1.2.0"
+    plugin-error "^1.0.1"
+    postcss "^7.0.2"
+    postcss-load-config "^2.0.0"
     vinyl-sourcemaps-apply "^0.2.1"
 
 gulp-util@^3.0.0:
@@ -1143,6 +1127,18 @@ ignore-walk@^3.0.1:
   dependencies:
     minimatch "^3.0.4"
 
+import-cwd@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/import-cwd/-/import-cwd-2.1.0.tgz#aa6cf36e722761285cb371ec6519f53e2435b0a9"
+  dependencies:
+    import-from "^2.1.0"
+
+import-from@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/import-from/-/import-from-2.1.0.tgz#335db7f2a7affd53aaa471d4b8021dee36b7f3b1"
+  dependencies:
+    resolve-from "^3.0.0"
+
 indexes-of@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/indexes-of/-/indexes-of-1.0.1.tgz#f30f716c8e2bd346c7b67d3df3915566a7c05607"
@@ -1199,6 +1195,10 @@ is-arrayish@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.2.1.tgz#77c99840527aa8ecb1a8ba697b80645a7a926a9d"
 
+is-arrayish@^0.3.1:
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.3.2.tgz#4574a2ae56f7ab206896fb431eaeed066fdf8f03"
+
 is-binary-path@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-binary-path/-/is-binary-path-1.0.1.tgz#75f16642b480f187a711c814161fd3a4a7655898"
@@ -1265,7 +1265,7 @@ is-extglob@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-1.0.0.tgz#ac468177c4943405a092fc8f29760c6ffc6206c0"
 
-is-extglob@^2.1.0, is-extglob@^2.1.1:
+is-extglob@^2.1.0:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-2.1.1.tgz#a88c02535791f02ed37c76a1b9ea9773c833f8c2"
 
@@ -1297,12 +1297,6 @@ is-glob@^3.1.0:
   dependencies:
     is-extglob "^2.1.0"
 
-is-glob@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-4.0.0.tgz#9521c76845cc2610a85203ddf080a958c2ffabc0"
-  dependencies:
-    is-extglob "^2.1.1"
-
 is-number@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/is-number/-/is-number-2.1.0.tgz#01fcbbb393463a548f2f466cce16dece49db908f"
@@ -1319,6 +1313,10 @@ is-number@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/is-number/-/is-number-4.0.0.tgz#0026e37f5454d73e356dfe6564699867c6a7f0ff"
 
+is-obj@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-obj/-/is-obj-1.0.1.tgz#3e4729ac1f5fde025cd7d83a896dab9f4f67db0f"
+
 is-odd@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/is-odd/-/is-odd-2.0.0.tgz#7646624671fd7ea558ccd9a2795182f2958f1b24"
@@ -1389,9 +1387,9 @@ js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
 
-js-yaml@^3.4.3:
-  version "3.11.0"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.11.0.tgz#597c1a8bd57152f26d622ce4117851a51f5ebaef"
+js-yaml@^3.9.0:
+  version "3.12.0"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.12.0.tgz#eaed656ec8344f10f527c6bfa1b6e2244de167d1"
   dependencies:
     argparse "^1.0.7"
     esprima "^4.0.0"
@@ -1400,6 +1398,10 @@ jsesc@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-1.3.0.tgz#46c3fec8c1892b12b0833db9bc7622176dbab34b"
 
+json-parse-better-errors@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz#bb867cfb3450e69107c131d1c514bab3dc8bcaa9"
+
 json5@^0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/json5/-/json5-0.5.1.tgz#1eade7acc012034ad84e2396767ead9fa5495821"
@@ -1410,10 +1412,6 @@ jsonfile@^4.0.0:
   optionalDependencies:
     graceful-fs "^4.1.6"
 
-kind-of@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-1.1.0.tgz#140a3d2d41a36d2efcfa9377b62c24f8495a5c44"
-
 kind-of@^3.0.2, kind-of@^3.0.3, kind-of@^3.2.0:
   version "3.2.2"
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-3.2.2.tgz#31ea21a734bab9bbb0f32466d893aea51e4a3c64"
@@ -1475,7 +1473,7 @@ lodash._reevaluate@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/lodash._reevaluate/-/lodash._reevaluate-3.0.0.tgz#58bc74c40664953ae0b124d806996daca431e2ed"
 
-lodash._reinterpolate@^3.0.0:
+lodash._reinterpolate@^3.0.0, lodash._reinterpolate@~3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/lodash._reinterpolate/-/lodash._reinterpolate-3.0.0.tgz#0ccf2d89166af03b3663c796538b75ac6e114d9d"
 
@@ -1523,6 +1521,13 @@ lodash.template@^3.0.0:
     lodash.restparam "^3.0.0"
     lodash.templatesettings "^3.0.0"
 
+lodash.template@^4.2.4:
+  version "4.4.0"
+  resolved "https://registry.yarnpkg.com/lodash.template/-/lodash.template-4.4.0.tgz#e73a0385c8355591746e020b99679c690e68fba0"
+  dependencies:
+    lodash._reinterpolate "~3.0.0"
+    lodash.templatesettings "^4.0.0"
+
 lodash.templatesettings@^3.0.0:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/lodash.templatesettings/-/lodash.templatesettings-3.1.1.tgz#fb307844753b66b9f1afa54e262c745307dba8e5"
@@ -1530,6 +1535,12 @@ lodash.templatesettings@^3.0.0:
     lodash._reinterpolate "^3.0.0"
     lodash.escape "^3.0.0"
 
+lodash.templatesettings@^4.0.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/lodash.templatesettings/-/lodash.templatesettings-4.1.0.tgz#2b4d4e95ba440d915ff08bc899e4553666713316"
+  dependencies:
+    lodash._reinterpolate "~3.0.0"
+
 lodash@^4.17.4:
   version "4.17.10"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
@@ -1715,6 +1726,12 @@ node-pre-gyp@^0.10.0:
     semver "^5.3.0"
     tar "^4"
 
+node-releases@^1.0.0-alpha.11:
+  version "1.0.0-alpha.11"
+  resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.0.0-alpha.11.tgz#73c810acc2e5b741a17ddfbb39dfca9ab9359d8a"
+  dependencies:
+    semver "^5.3.0"
+
 nopt@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/nopt/-/nopt-4.0.1.tgz#d0d4685afd5415193c8c7505602d0d17cd64474d"
@@ -1835,7 +1852,7 @@ ordered-read-streams@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/ordered-read-streams/-/ordered-read-streams-0.1.0.tgz#fd565a9af8eb4473ba69b6ed8a34352cb552f126"
 
-os-homedir@^1.0.0, os-homedir@^1.0.1:
+os-homedir@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-homedir/-/os-homedir-1.0.2.tgz#ffbc4988336e0e833de0c168c7ef152121aa7fb3"
 
@@ -1875,11 +1892,12 @@ parse-glob@^3.0.4:
     is-extglob "^1.0.0"
     is-glob "^2.0.0"
 
-parse-json@^2.2.0:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-2.2.0.tgz#f480f40434ef80741f8469099f8dea18f55a4dc9"
+parse-json@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-4.0.0.tgz#be35f5425be1f7f6c747184f98a788cb99477ee0"
   dependencies:
-    error-ex "^1.2.0"
+    error-ex "^1.3.1"
+    json-parse-better-errors "^1.0.1"
 
 parse-passwd@^1.0.0:
   version "1.0.0"
@@ -1907,25 +1925,7 @@ path-root@^0.1.1:
   dependencies:
     path-root-regex "^0.1.0"
 
-pify@^2.0.0, pify@^2.3.0:
-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
-
-pify@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/pify/-/pify-3.0.0.tgz#e5a4acd2c101fdf3d9a4d07f0dbc4db49dd28176"
-
-pinkie-promise@^2.0.0:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/pinkie-promise/-/pinkie-promise-2.0.1.tgz#2135d6dfa7a358c069ac9b178776288228450ffa"
-  dependencies:
-    pinkie "^2.0.0"
-
-pinkie@^2.0.0:
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
-
-plugin-error@1.0.1:
+plugin-error@1.0.1, plugin-error@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/plugin-error/-/plugin-error-1.0.1.tgz#77016bd8919d0ac377fdcdd0322328953ca5781c"
   dependencies:
@@ -1934,25 +1934,24 @@ plugin-error@1.0.1:
     arr-union "^3.1.0"
     extend-shallow "^3.0.2"
 
-plugin-error@^0.1.2:
-  version "0.1.2"
-  resolved "https://registry.yarnpkg.com/plugin-error/-/plugin-error-0.1.2.tgz#3b9bb3335ccf00f425e07437e19276967da47ace"
-  dependencies:
-    ansi-cyan "^0.1.1"
-    ansi-red "^0.1.1"
-    arr-diff "^1.0.1"
-    arr-union "^2.0.1"
-    extend-shallow "^1.1.2"
-
 posix-character-classes@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
 
-postcss-advanced-variables@1.2.2:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/postcss-advanced-variables/-/postcss-advanced-variables-1.2.2.tgz#90a6213262e66a050a368b4a9c5d4778d72dbd74"
+postcss-advanced-variables@^2.3.3:
+  version "2.3.3"
+  resolved "https://registry.yarnpkg.com/postcss-advanced-variables/-/postcss-advanced-variables-2.3.3.tgz#80ac5b05988d02f63352974491e319910f33337e"
   dependencies:
-    postcss "^5.0.10"
+    "@csstools/sass-import-resolve" "^1"
+    postcss "^6"
+
+postcss-apply@^0.9.0:
+  version "0.9.0"
+  resolved "https://registry.yarnpkg.com/postcss-apply/-/postcss-apply-0.9.0.tgz#a152e6e34a6c55d0895751929319c262c5d8c289"
+  dependencies:
+    babel-runtime "^6.23.0"
+    balanced-match "^0.4.2"
+    postcss "^6.0.0"
 
 postcss-atroot@^0.1.3:
   version "0.1.3"
@@ -1960,6 +1959,13 @@ postcss-atroot@^0.1.3:
   dependencies:
     postcss "^5.0.5"
 
+postcss-attribute-case-insensitive@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-attribute-case-insensitive/-/postcss-attribute-case-insensitive-2.0.0.tgz#94dc422c8f90997f16bd33a3654bbbec084963b4"
+  dependencies:
+    postcss "^6.0.0"
+    postcss-selector-parser "^2.2.3"
+
 postcss-calc@^6.0.1:
   version "6.0.1"
   resolved "https://registry.yarnpkg.com/postcss-calc/-/postcss-calc-6.0.1.tgz#3d24171bbf6e7629d422a436ebfe6dd9511f4330"
@@ -1969,13 +1975,34 @@ postcss-calc@^6.0.1:
     postcss-selector-parser "^2.2.2"
     reduce-css-calc "^2.0.0"
 
-postcss-color-function@^4.0.0:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/postcss-color-function/-/postcss-color-function-4.0.1.tgz#402b3f2cebc3f6947e618fb6be3654fbecef6444"
+postcss-color-hex-alpha@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-color-hex-alpha/-/postcss-color-hex-alpha-3.0.0.tgz#1e53e6c8acb237955e8fd08b7ecdb1b8b8309f95"
   dependencies:
-    css-color-function "~1.3.3"
+    color "^1.0.3"
     postcss "^6.0.1"
     postcss-message-helpers "^2.0.0"
+
+postcss-color-mod-function@^2.4.2:
+  version "2.4.3"
+  resolved "https://registry.yarnpkg.com/postcss-color-mod-function/-/postcss-color-mod-function-2.4.3.tgz#14a97f5b17a5f19396e9dea7ffcb5be732592baf"
+  dependencies:
+    "@csstools/convert-colors" "^1.4.0"
+    postcss "^6.0.23"
+    postcss-values-parser "^1.5.0"
+
+postcss-color-rebeccapurple@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/postcss-color-rebeccapurple/-/postcss-color-rebeccapurple-3.1.0.tgz#ce1269ecc2d0d8bf92aab44bd884e633124c33ec"
+  dependencies:
+    postcss "^6.0.22"
+    postcss-values-parser "^1.5.0"
+
+postcss-color-rgb@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-color-rgb/-/postcss-color-rgb-2.0.0.tgz#14539c8a7131494b482e0dd1cc265ff6514b5263"
+  dependencies:
+    postcss "^6.0.1"
     postcss-value-parser "^3.3.0"
 
 postcss-custom-media@^6.0.0:
@@ -1984,9 +2011,9 @@ postcss-custom-media@^6.0.0:
   dependencies:
     postcss "^6.0.1"
 
-postcss-custom-properties@^6.1.0:
-  version "6.3.1"
-  resolved "https://registry.yarnpkg.com/postcss-custom-properties/-/postcss-custom-properties-6.3.1.tgz#5c52abde313d7ec9368c4abf67d27a656cba8b39"
+postcss-custom-properties@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-custom-properties/-/postcss-custom-properties-7.0.0.tgz#24dc4fbe6d6ed550ea4fd3b11204660e9ffa3b33"
   dependencies:
     balanced-match "^1.0.0"
     postcss "^6.0.18"
@@ -1998,64 +2025,57 @@ postcss-custom-selectors@^4.0.1:
     postcss "^6.0.1"
     postcss-selector-matches "^3.0.0"
 
-postcss-easy-import@^3.0.0:
+postcss-dir-pseudo-class@^3.0.0:
   version "3.0.0"
-  resolved "https://registry.yarnpkg.com/postcss-easy-import/-/postcss-easy-import-3.0.0.tgz#8eaaf5ae59566083d0cae98735dfd803e3ab194d"
+  resolved "https://registry.yarnpkg.com/postcss-dir-pseudo-class/-/postcss-dir-pseudo-class-3.0.0.tgz#31a18af3b9b1b33be635599b998a9829896c3fed"
+  dependencies:
+    postcss "^6.0.20"
+    postcss-selector-parser "^3.1.1"
+
+postcss-extend-rule@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/postcss-extend-rule/-/postcss-extend-rule-1.1.0.tgz#11e4d590ffe4253b853ef1fc03be7167da607d38"
   dependencies:
-    globby "^6.1.0"
-    is-glob "^4.0.0"
-    lodash "^4.17.4"
-    object-assign "^4.0.1"
-    pify "^3.0.0"
     postcss "^6.0.11"
-    postcss-import "^10.0.0"
-    resolve "^1.1.7"
+    postcss-nesting "^4.2.1"
 
-postcss-extend@^1.0.5:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/postcss-extend/-/postcss-extend-1.0.5.tgz#5ea98bf787ba3cacf4df4609743f80a833b1d0e7"
+postcss-focus-visible@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-focus-visible/-/postcss-focus-visible-2.0.0.tgz#a6b9881f6710f6251790e2f151c94b161e23eeb6"
   dependencies:
-    postcss "^5.0.4"
+    postcss "^6.0"
 
-postcss-import@^10.0.0:
-  version "10.0.0"
-  resolved "https://registry.yarnpkg.com/postcss-import/-/postcss-import-10.0.0.tgz#4c85c97b099136cc5ea0240dc1dfdbfde4e2ebbe"
+postcss-font-family-system-ui@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-font-family-system-ui/-/postcss-font-family-system-ui-3.0.0.tgz#675fe7a9e029669f05f8dba2e44c2225ede80623"
+  dependencies:
+    postcss "^6.0"
+
+postcss-font-variant@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-font-variant/-/postcss-font-variant-3.0.0.tgz#08ccc88f6050ba82ed8ef2cc76c0c6a6b41f183e"
   dependencies:
-    object-assign "^4.0.1"
     postcss "^6.0.1"
-    postcss-value-parser "^3.2.3"
-    read-cache "^1.0.0"
-    resolve "^1.1.7"
 
-postcss-js@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/postcss-js/-/postcss-js-1.0.1.tgz#ffaf29226e399ea74b5dce02cab1729d7addbc7b"
+postcss-initial@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-initial/-/postcss-initial-2.0.0.tgz#72715f7336e0bb79351d99ee65c4a253a8441ba4"
   dependencies:
-    camelcase-css "^1.0.1"
-    postcss "^6.0.11"
+    lodash.template "^4.2.4"
+    postcss "^6.0.1"
 
-postcss-load-config@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/postcss-load-config/-/postcss-load-config-1.2.0.tgz#539e9afc9ddc8620121ebf9d8c3673e0ce50d28a"
+postcss-load-config@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-load-config/-/postcss-load-config-2.0.0.tgz#f1312ddbf5912cd747177083c5ef7a19d62ee484"
   dependencies:
-    cosmiconfig "^2.1.0"
-    object-assign "^4.1.0"
-    postcss-load-options "^1.2.0"
-    postcss-load-plugins "^2.3.0"
+    cosmiconfig "^4.0.0"
+    import-cwd "^2.0.0"
 
-postcss-load-options@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/postcss-load-options/-/postcss-load-options-1.2.0.tgz#b098b1559ddac2df04bc0bb375f99a5cfe2b6d8c"
+postcss-logical@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/postcss-logical/-/postcss-logical-1.1.1.tgz#bcabf0638d8aa747743b32bc52f9d90d4a3313d2"
   dependencies:
-    cosmiconfig "^2.1.0"
-    object-assign "^4.1.0"
-
-postcss-load-plugins@^2.3.0:
-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/postcss-load-plugins/-/postcss-load-plugins-2.3.0.tgz#745768116599aca2f009fad426b00175049d8d92"
-  dependencies:
-    cosmiconfig "^2.1.1"
-    object-assign "^4.1.0"
+    postcss "^6.0.20"
 
 postcss-media-minmax@^3.0.0:
   version "3.0.0"
@@ -2067,43 +2087,77 @@ postcss-message-helpers@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/postcss-message-helpers/-/postcss-message-helpers-2.0.0.tgz#a4f2f4fab6e4fe002f0aed000478cdf52f9ba60e"
 
-postcss-mixins@^6.0.1:
-  version "6.2.0"
-  resolved "https://registry.yarnpkg.com/postcss-mixins/-/postcss-mixins-6.2.0.tgz#fa9d2c2166b2ae7745956c727ab9dd2de4b96a40"
+postcss-nested@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-3.0.0.tgz#cde40bd07a078565f3df72e2dc2665871c724852"
   dependencies:
-    globby "^6.1.0"
-    postcss "^6.0.13"
-    postcss-js "^1.0.1"
-    postcss-simple-vars "^4.1.0"
-    sugarss "^1.0.0"
+    postcss "^6.0.14"
+    postcss-selector-parser "^3.1.1"
 
-postcss-nested@^2.0.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-2.1.2.tgz#04057281f9631fef684857fb0119bae04ede03c6"
-  dependencies:
-    postcss "^6.0.9"
-    postcss-selector-parser "^2.2.3"
-
-postcss-nesting@^4.0.1:
+postcss-nesting@^4.2.1:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/postcss-nesting/-/postcss-nesting-4.2.1.tgz#0483bce338b3f0828ced90ff530b29b98b00300d"
   dependencies:
     postcss "^6.0.11"
 
-postcss-partial-import@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/postcss-partial-import/-/postcss-partial-import-4.1.0.tgz#f6c3e78e7bbeda4d9dab96d360367b90b353f9a4"
+postcss-page-break@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-page-break/-/postcss-page-break-1.0.0.tgz#09a63b6e03db092d38569b33dcba42a343ace60b"
   dependencies:
-    glob "^7.1.1"
-    postcss-import "^10.0.0"
+    postcss "^6.0.16"
 
-postcss-property-lookup@^1.2.1:
-  version "1.2.1"
-  resolved "https://registry.yarnpkg.com/postcss-property-lookup/-/postcss-property-lookup-1.2.1.tgz#30450a1361b7aae758bbedd5201fbe057bb8270b"
+postcss-preset-env@^3.2.2:
+  version "3.5.0"
+  resolved "https://registry.yarnpkg.com/postcss-preset-env/-/postcss-preset-env-3.5.0.tgz#b3aae2c65e5b3fa61d735b70392fa758a665b785"
+  dependencies:
+    "@csstools/postcss-image-set-function" "^1.0.0"
+    browserslist "^3.2.4"
+    caniuse-lite "^1.0.30000823"
+    cssdb "^1.6.0"
+    postcss "^6.0.21"
+    postcss-apply "^0.9.0"
+    postcss-attribute-case-insensitive "^2.0.0"
+    postcss-color-hex-alpha "^3.0.0"
+    postcss-color-mod-function "^2.4.2"
+    postcss-color-rebeccapurple "^3.0.0"
+    postcss-color-rgb "^2.0.0"
+    postcss-custom-media "^6.0.0"
+    postcss-custom-properties "^7.0.0"
+    postcss-custom-selectors "^4.0.1"
+    postcss-dir-pseudo-class "^3.0.0"
+    postcss-focus-visible "^2.0.0"
+    postcss-font-family-system-ui "^3.0.0"
+    postcss-font-variant "^3.0.0"
+    postcss-initial "^2.0.0"
+    postcss-logical "^1.1.1"
+    postcss-media-minmax "^3.0.0"
+    postcss-nesting "^4.2.1"
+    postcss-page-break "^1.0.0"
+    postcss-pseudo-class-any-link "^4.0.0"
+    postcss-replace-overflow-wrap "^2.0.0"
+    postcss-selector-matches "^3.0.1"
+    postcss-selector-not "^3.0.1"
+
+postcss-property-lookup@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-property-lookup/-/postcss-property-lookup-2.0.0.tgz#c995d1df42a75420f2aea834c2cbe296b2c15922"
   dependencies:
     object-assign "^4.0.1"
-    postcss "^5.0.4"
-    tcomb "^2.5.1"
+    postcss "^6.0.6"
+    tcomb "^3.2.21"
+
+postcss-pseudo-class-any-link@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-pseudo-class-any-link/-/postcss-pseudo-class-any-link-4.0.0.tgz#9152a0613d3450720513e8892854bae42d0ee68e"
+  dependencies:
+    postcss "^6.0.1"
+    postcss-selector-parser "^2.2.3"
+
+postcss-replace-overflow-wrap@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-replace-overflow-wrap/-/postcss-replace-overflow-wrap-2.0.0.tgz#794db6faa54f8db100854392a93af45768b4e25b"
+  dependencies:
+    postcss "^6.0.1"
 
 postcss-selector-matches@^3.0.0, postcss-selector-matches@^3.0.1:
   version "3.0.1"
@@ -2127,11 +2181,13 @@ postcss-selector-parser@^2.2.2, postcss-selector-parser@^2.2.3:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss-simple-vars@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/postcss-simple-vars/-/postcss-simple-vars-4.1.0.tgz#043248cfef8d3f51b3486a28c09f8375dbf1b2f9"
+postcss-selector-parser@^3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-3.1.1.tgz#4f875f4afb0c96573d5cf4d74011aee250a7e865"
   dependencies:
-    postcss "^6.0.9"
+    dot-prop "^4.1.1"
+    indexes-of "^1.0.1"
+    uniq "^1.0.1"
 
 postcss-theme-variables@^1.0.0:
   version "1.0.0"
@@ -2145,7 +2201,15 @@ postcss-value-parser@^3.2.3, postcss-value-parser@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.0.tgz#87f38f9f18f774a4ab4c8a232f5c5ce8872a9d15"
 
-postcss@^5.0.10, postcss@^5.0.4, postcss@^5.0.5:
+postcss-values-parser@^1.5.0:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/postcss-values-parser/-/postcss-values-parser-1.5.0.tgz#5d9fa63e2bcb0179ce48f3235303765eb89f3047"
+  dependencies:
+    flatten "^1.0.2"
+    indexes-of "^1.0.1"
+    uniq "^1.0.1"
+
+postcss@^5.0.5:
   version "5.2.18"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-5.2.18.tgz#badfa1497d46244f6390f58b319830d9107853c5"
   dependencies:
@@ -2154,7 +2218,15 @@ postcss@^5.0.10, postcss@^5.0.4, postcss@^5.0.5:
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
-postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.13, postcss@^6.0.14, postcss@^6.0.18, postcss@^6.0.21, postcss@^6.0.3, postcss@^6.0.9:
+postcss@^6, postcss@^6.0, postcss@^6.0.16, postcss@^6.0.19, postcss@^6.0.20, postcss@^6.0.22, postcss@^6.0.23, postcss@^6.0.6:
+  version "6.0.23"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.23.tgz#61c82cc328ac60e677645f979054eb98bc0e3324"
+  dependencies:
+    chalk "^2.4.1"
+    source-map "^0.6.1"
+    supports-color "^5.4.0"
+
+postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.14, postcss@^6.0.18, postcss@^6.0.21:
   version "6.0.21"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.21.tgz#8265662694eddf9e9a5960db6da33c39e4cd069d"
   dependencies:
@@ -2162,26 +2234,25 @@ postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.13, postcss@^6.0.1
     source-map "^0.6.1"
     supports-color "^5.3.0"
 
-precss@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/precss/-/precss-2.0.0.tgz#7f567e3318e06d44c8fdbf9e58452e8358bf4b71"
+postcss@^7.0.2:
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.2.tgz#7b5a109de356804e27f95a960bef0e4d5bc9bb18"
   dependencies:
-    postcss "^6.0.3"
-    postcss-advanced-variables "1.2.2"
+    chalk "^2.4.1"
+    source-map "^0.6.1"
+    supports-color "^5.4.0"
+
+precss@^3.1.2:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/precss/-/precss-3.1.2.tgz#c82c0aa4ca5fe1e879799d697db0fac6d15d23bc"
+  dependencies:
+    postcss "^6.0.19"
+    postcss-advanced-variables "^2.3.3"
     postcss-atroot "^0.1.3"
-    postcss-color-function "^4.0.0"
-    postcss-custom-media "^6.0.0"
-    postcss-custom-properties "^6.1.0"
-    postcss-custom-selectors "^4.0.1"
-    postcss-extend "^1.0.5"
-    postcss-media-minmax "^3.0.0"
-    postcss-mixins "^6.0.1"
-    postcss-nested "^2.0.2"
-    postcss-nesting "^4.0.1"
-    postcss-partial-import "^4.1.0"
-    postcss-property-lookup "^1.2.1"
-    postcss-selector-matches "^3.0.1"
-    postcss-selector-not "^3.0.1"
+    postcss-extend-rule "^1.1.0"
+    postcss-nested "^3.0.0"
+    postcss-preset-env "^3.2.2"
+    postcss-property-lookup "^2.0.0"
 
 preserve@^0.2.0:
   version "0.2.0"
@@ -2216,12 +2287,6 @@ rc@^1.2.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-read-cache@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/read-cache/-/read-cache-1.0.0.tgz#e664ef31161166c9751cdbe8dbcf86b5fb58f774"
-  dependencies:
-    pify "^2.3.0"
-
 "readable-stream@>=1.0.33-1 <1.1.0-0":
   version "1.0.34"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-1.0.34.tgz#125820e34bc842d2f2aaafafe4c2916ee32c157c"
@@ -2317,9 +2382,9 @@ replace-ext@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/replace-ext/-/replace-ext-0.0.1.tgz#29bbd92078a739f0bcce2b4ee41e837953522924"
 
-require-from-string@^1.1.0:
-  version "1.2.1"
-  resolved "https://registry.yarnpkg.com/require-from-string/-/require-from-string-1.2.1.tgz#529c9ccef27380adfec9a2f965b649bbee636418"
+require-from-string@^2.0.1:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/require-from-string/-/require-from-string-2.0.2.tgz#89a7fdd938261267318eafe14f9c32e598c36909"
 
 resolve-dir@^1.0.0, resolve-dir@^1.0.1:
   version "1.0.1"
@@ -2328,6 +2393,10 @@ resolve-dir@^1.0.0, resolve-dir@^1.0.1:
     expand-tilde "^2.0.0"
     global-modules "^1.0.0"
 
+resolve-from@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-3.0.0.tgz#b22c7af7d9d6881bc8b6e653335eebcb0a188748"
+
 resolve-url@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
@@ -2342,10 +2411,6 @@ ret@~0.1.10:
   version "0.1.15"
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
 
-rgb@~0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/rgb/-/rgb-0.1.0.tgz#be27b291e8feffeac1bd99729721bfa40fc037b5"
-
 rimraf@^2.6.1:
   version "2.6.2"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.2.tgz#2ed8150d24a16ea8651e6d6ef0f47c4158ce7a36"
@@ -2420,6 +2485,12 @@ signal-exit@^3.0.0:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
 
+simple-swizzle@^0.2.2:
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/simple-swizzle/-/simple-swizzle-0.2.2.tgz#a4da6b635ffcccca33f70d17cb92592de95e557a"
+  dependencies:
+    is-arrayish "^0.3.1"
+
 slash@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/slash/-/slash-1.0.0.tgz#c41f2f6c39fc16d1cd17ad4b5d896114ae470d55"
@@ -2471,11 +2542,11 @@ source-map-url@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
 
-source-map@0.5.x, source-map@^0.5.1, source-map@^0.5.6, source-map@^0.5.7:
+source-map@^0.5.1, source-map@^0.5.6, source-map@^0.5.7:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
-source-map@^0.6.1:
+source-map@^0.6.1, source-map@~0.6.0:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
 
@@ -2552,12 +2623,6 @@ strip-json-comments@~2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
 
-sugarss@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/sugarss/-/sugarss-1.0.1.tgz#be826d9003e0f247735f92365dc3fd7f1bae9e44"
-  dependencies:
-    postcss "^6.0.14"
-
 supports-color@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"
@@ -2574,6 +2639,12 @@ supports-color@^5.3.0:
   dependencies:
     has-flag "^3.0.0"
 
+supports-color@^5.4.0:
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.5.0.tgz#e2e69a44ac8772f78a1ec0b35b689df6530efc8f"
+  dependencies:
+    has-flag "^3.0.0"
+
 tar@^4:
   version "4.4.4"
   resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.4.tgz#ec8409fae9f665a4355cc3b4087d0820232bb8cd"
@@ -2586,9 +2657,9 @@ tar@^4:
     safe-buffer "^5.1.2"
     yallist "^3.0.2"
 
-tcomb@^2.5.1:
-  version "2.7.0"
-  resolved "https://registry.yarnpkg.com/tcomb/-/tcomb-2.7.0.tgz#10d62958041669a5d53567b9a4ee8cde22b1c2b0"
+tcomb@^3.2.21:
+  version "3.2.27"
+  resolved "https://registry.yarnpkg.com/tcomb/-/tcomb-3.2.27.tgz#f4928bfc536b959d21a47e5f5f1ca2b2e4b7188a"
 
 through2@2.0.3, through2@^2.0.0:
   version "2.0.3"
diff --git a/postcss.config.js b/postcss.config.js
index 5485e1305..d6c18d9ab 100644
--- a/postcss.config.js
+++ b/postcss.config.js
@@ -1,6 +1,5 @@
 module.exports = {
   plugins: {
-    'postcss-easy-import': {},
     'precss': {},
     'postcss-calc': {},
     'autoprefixer': {
diff --git a/yarn.lock b/yarn.lock
index a6188ed3d..73c83cc80 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -184,6 +184,21 @@
     lodash "^4.17.10"
     to-fast-properties "^2.0.0"
 
+"@csstools/convert-colors@^1.4.0":
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/@csstools/convert-colors/-/convert-colors-1.4.0.tgz#ad495dc41b12e75d588c6db8b9834f08fa131eb7"
+
+"@csstools/postcss-image-set-function@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@csstools/postcss-image-set-function/-/postcss-image-set-function-1.0.0.tgz#1ef0913d90a9c4440495eb41624c202e53a703f3"
+  dependencies:
+    postcss "^6.0.20"
+    postcss-value-parser "^3.3.0"
+
+"@csstools/sass-import-resolve@^1":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@csstools/sass-import-resolve/-/sass-import-resolve-1.0.0.tgz#32c3cdb2f7af3cd8f0dca357b592e7271f3831b5"
+
 "@mrmlnc/readdir-enhanced@^2.2.1":
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz#524af240d1a360527b730475ecfa1344aa540dde"
@@ -803,12 +818,12 @@ autoprefixer@^9.0.0:
     postcss "^7.0.2"
     postcss-value-parser "^3.2.3"
 
-autoprefixer@^9.1.2:
-  version "9.1.2"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.1.2.tgz#73672614e3ee43a433b84c1c2a4b1ca392d2f6a1"
+autoprefixer@^9.1.3:
+  version "9.1.3"
+  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.1.3.tgz#bd5940ccb9d1bfa3508308659915f0a14394c8d5"
   dependencies:
     browserslist "^4.0.2"
-    caniuse-lite "^1.0.30000877"
+    caniuse-lite "^1.0.30000878"
     normalize-range "^0.1.2"
     num2fraction "^1.2.2"
     postcss "^7.0.2"
@@ -1525,7 +1540,7 @@ babel-register@^6.26.0:
     mkdirp "^0.5.1"
     source-map-support "^0.4.15"
 
-babel-runtime@6.x, babel-runtime@^6.0.0, babel-runtime@^6.18.0, babel-runtime@^6.22.0, babel-runtime@^6.26.0:
+babel-runtime@6.x, babel-runtime@^6.0.0, babel-runtime@^6.18.0, babel-runtime@^6.22.0, babel-runtime@^6.23.0, babel-runtime@^6.26.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-runtime/-/babel-runtime-6.26.0.tgz#965c7058668e82b55d7bfe04ff2337bc8b5647fe"
   dependencies:
@@ -1583,10 +1598,6 @@ bail@^1.0.0:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/bail/-/bail-1.0.3.tgz#63cfb9ddbac829b02a3128cd53224be78e6c21a3"
 
-balanced-match@0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-0.1.0.tgz#b504bd05869b39259dd0c5efc35d843176dccc4a"
-
 balanced-match@^0.4.2:
   version "0.4.2"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-0.4.2.tgz#cb3f3e3c732dc0f01ee70b403f302e61d7709838"
@@ -1775,6 +1786,13 @@ browserify-zlib@^0.2.0:
   dependencies:
     pako "~1.0.5"
 
+browserslist@^3.2.4:
+  version "3.2.8"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-3.2.8.tgz#b0005361d6471f0f5952797a76fc985f1f978fc6"
+  dependencies:
+    caniuse-lite "^1.0.30000844"
+    electron-to-chromium "^1.3.47"
+
 browserslist@^3.2.6:
   version "3.2.6"
   resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-3.2.6.tgz#138a44d04a9af64443679191d041f28ce5b965d5"
@@ -1891,10 +1909,6 @@ camel-case@3.0.x:
     no-case "^2.2.0"
     upper-case "^1.1.1"
 
-camelcase-css@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/camelcase-css/-/camelcase-css-1.0.1.tgz#157c4238265f5cf94a1dffde86446552cbf3f705"
-
 camelcase-keys@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/camelcase-keys/-/camelcase-keys-2.1.0.tgz#308beeaffdf28119051efa1d932213c91b8f92e7"
@@ -1926,6 +1940,10 @@ camelize@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/camelize/-/camelize-1.0.0.tgz#164a5483e630fa4321e5af07020e531831b2609b"
 
+caniuse-lite@^1.0.30000823, caniuse-lite@^1.0.30000844, caniuse-lite@^1.0.30000878:
+  version "1.0.30000878"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000878.tgz#c644c39588dd42d3498e952234c372e5a40a4123"
+
 caniuse-lite@^1.0.30000830:
   version "1.0.30000830"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000830.tgz#cb96b8a2dd3cbfe04acea2af3c4e894249095328"
@@ -1934,7 +1952,7 @@ caniuse-lite@^1.0.30000865:
   version "1.0.30000865"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000865.tgz#70026616e8afe6e1442f8bb4e1092987d81a2f25"
 
-caniuse-lite@^1.0.30000876, caniuse-lite@^1.0.30000877:
+caniuse-lite@^1.0.30000876:
   version "1.0.30000877"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000877.tgz#f189673b86ecc06436520e3e391de6a13ca923b4"
 
@@ -2247,33 +2265,43 @@ collection-visit@^1.0.0:
     map-visit "^1.0.0"
     object-visit "^1.0.0"
 
-color-convert@^1.3.0, color-convert@^1.9.0:
+color-convert@^1.8.2:
+  version "1.9.2"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.2.tgz#49881b8fba67df12a96bdf3f56c0aab9e7913147"
+  dependencies:
+    color-name "1.1.1"
+
+color-convert@^1.9.0:
   version "1.9.1"
   resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.1.tgz#c1261107aeb2f294ebffec9ed9ecad529a6097ed"
   dependencies:
     color-name "^1.1.1"
 
+color-name@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.1.tgz#4b1415304cf50028ea81643643bd82ea05803689"
+
 color-name@^1.0.0, color-name@^1.1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
 
-color-string@^0.3.0:
-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/color-string/-/color-string-0.3.0.tgz#27d46fb67025c5c2fa25993bfbf579e47841b991"
+color-string@^1.4.0:
+  version "1.5.3"
+  resolved "https://registry.yarnpkg.com/color-string/-/color-string-1.5.3.tgz#c9bbc5f01b58b5492f3d6857459cb6590ce204cc"
   dependencies:
     color-name "^1.0.0"
+    simple-swizzle "^0.2.2"
 
 color-support@^1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-support/-/color-support-1.1.3.tgz#93834379a1cc9a0c61f82f52f0d04322251bd5a2"
 
-color@^0.11.0:
-  version "0.11.4"
-  resolved "https://registry.yarnpkg.com/color/-/color-0.11.4.tgz#6d7b5c74fb65e841cd48792ad1ed5e07b904d764"
+color@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/color/-/color-1.0.3.tgz#e48e832d85f14ef694fb468811c2d5cfe729b55d"
   dependencies:
-    clone "^1.0.2"
-    color-convert "^1.3.0"
-    color-string "^0.3.0"
+    color-convert "^1.8.2"
+    color-string "^1.4.0"
 
 combined-stream@1.0.6, combined-stream@~1.0.5:
   version "1.0.6"
@@ -2526,15 +2554,6 @@ crypto-random-string@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/crypto-random-string/-/crypto-random-string-1.0.0.tgz#a230f64f568310e1498009940790ec99545bca7e"
 
-css-color-function@~1.3.3:
-  version "1.3.3"
-  resolved "https://registry.yarnpkg.com/css-color-function/-/css-color-function-1.3.3.tgz#8ed24c2c0205073339fafa004bc8c141fccb282e"
-  dependencies:
-    balanced-match "0.1.0"
-    color "^0.11.0"
-    debug "^3.1.0"
-    rgb "~0.1.0"
-
 css-loader@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/css-loader/-/css-loader-1.0.0.tgz#9f46aaa5ca41dbe31860e3b62b8e23c42916bf56"
@@ -2586,6 +2605,10 @@ css@^2.1.0:
     source-map-resolve "^0.3.0"
     urix "^0.1.0"
 
+cssdb@^1.6.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/cssdb/-/cssdb-1.6.0.tgz#3360c4163e07cf4d1efe58c1bc15170535f4d393"
+
 cssesc@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-0.1.0.tgz#c814903e45623371a0477b40109aaafbeeaddbb4"
@@ -3024,6 +3047,10 @@ electron-to-chromium@^1.3.42:
   version "1.3.45"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.45.tgz#458ac1b1c5c760ce8811a16d2bfbd97ec30bafb8"
 
+electron-to-chromium@^1.3.47:
+  version "1.3.61"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.61.tgz#a8ac295b28d0f03d85e37326fd16b6b6b17a1795"
+
 electron-to-chromium@^1.3.52:
   version "1.3.55"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.55.tgz#f150e10b20b77d9d41afcca312efe0c3b1a7fdce"
@@ -4690,6 +4717,10 @@ is-arrayish@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.2.1.tgz#77c99840527aa8ecb1a8ba697b80645a7a926a9d"
 
+is-arrayish@^0.3.1:
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.3.2.tgz#4574a2ae56f7ab206896fb431eaeed066fdf8f03"
+
 is-binary-path@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-binary-path/-/is-binary-path-1.0.1.tgz#75f16642b480f187a711c814161fd3a4a7655898"
@@ -5984,7 +6015,7 @@ lodash.template@^3.0.0:
     lodash.restparam "^3.0.0"
     lodash.templatesettings "^3.0.0"
 
-lodash.template@^4.4.0:
+lodash.template@^4.2.4, lodash.template@^4.4.0:
   version "4.4.0"
   resolved "https://registry.yarnpkg.com/lodash.template/-/lodash.template-4.4.0.tgz#e73a0385c8355591746e020b99679c690e68fba0"
   dependencies:
@@ -7233,7 +7264,7 @@ performance-now@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
 
-pify@^2.0.0, pify@^2.3.0:
+pify@^2.0.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
 
@@ -7299,11 +7330,20 @@ posix-character-classes@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
 
-postcss-advanced-variables@1.2.2:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/postcss-advanced-variables/-/postcss-advanced-variables-1.2.2.tgz#90a6213262e66a050a368b4a9c5d4778d72dbd74"
+postcss-advanced-variables@^2.3.3:
+  version "2.3.3"
+  resolved "https://registry.yarnpkg.com/postcss-advanced-variables/-/postcss-advanced-variables-2.3.3.tgz#80ac5b05988d02f63352974491e319910f33337e"
   dependencies:
-    postcss "^5.0.10"
+    "@csstools/sass-import-resolve" "^1"
+    postcss "^6"
+
+postcss-apply@^0.9.0:
+  version "0.9.0"
+  resolved "https://registry.yarnpkg.com/postcss-apply/-/postcss-apply-0.9.0.tgz#a152e6e34a6c55d0895751929319c262c5d8c289"
+  dependencies:
+    babel-runtime "^6.23.0"
+    balanced-match "^0.4.2"
+    postcss "^6.0.0"
 
 postcss-atroot@^0.1.3:
   version "0.1.3"
@@ -7311,6 +7351,13 @@ postcss-atroot@^0.1.3:
   dependencies:
     postcss "^5.0.5"
 
+postcss-attribute-case-insensitive@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-attribute-case-insensitive/-/postcss-attribute-case-insensitive-2.0.0.tgz#94dc422c8f90997f16bd33a3654bbbec084963b4"
+  dependencies:
+    postcss "^6.0.0"
+    postcss-selector-parser "^2.2.3"
+
 postcss-calc@^6.0.0:
   version "6.0.1"
   resolved "https://registry.yarnpkg.com/postcss-calc/-/postcss-calc-6.0.1.tgz#3d24171bbf6e7629d422a436ebfe6dd9511f4330"
@@ -7320,13 +7367,34 @@ postcss-calc@^6.0.0:
     postcss-selector-parser "^2.2.2"
     reduce-css-calc "^2.0.0"
 
-postcss-color-function@^4.0.0:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/postcss-color-function/-/postcss-color-function-4.0.1.tgz#402b3f2cebc3f6947e618fb6be3654fbecef6444"
+postcss-color-hex-alpha@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-color-hex-alpha/-/postcss-color-hex-alpha-3.0.0.tgz#1e53e6c8acb237955e8fd08b7ecdb1b8b8309f95"
   dependencies:
-    css-color-function "~1.3.3"
+    color "^1.0.3"
     postcss "^6.0.1"
     postcss-message-helpers "^2.0.0"
+
+postcss-color-mod-function@^2.4.2:
+  version "2.4.3"
+  resolved "https://registry.yarnpkg.com/postcss-color-mod-function/-/postcss-color-mod-function-2.4.3.tgz#14a97f5b17a5f19396e9dea7ffcb5be732592baf"
+  dependencies:
+    "@csstools/convert-colors" "^1.4.0"
+    postcss "^6.0.23"
+    postcss-values-parser "^1.5.0"
+
+postcss-color-rebeccapurple@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/postcss-color-rebeccapurple/-/postcss-color-rebeccapurple-3.1.0.tgz#ce1269ecc2d0d8bf92aab44bd884e633124c33ec"
+  dependencies:
+    postcss "^6.0.22"
+    postcss-values-parser "^1.5.0"
+
+postcss-color-rgb@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-color-rgb/-/postcss-color-rgb-2.0.0.tgz#14539c8a7131494b482e0dd1cc265ff6514b5263"
+  dependencies:
+    postcss "^6.0.1"
     postcss-value-parser "^3.3.0"
 
 postcss-custom-media@^6.0.0:
@@ -7335,9 +7403,9 @@ postcss-custom-media@^6.0.0:
   dependencies:
     postcss "^6.0.1"
 
-postcss-custom-properties@^6.1.0:
-  version "6.3.1"
-  resolved "https://registry.yarnpkg.com/postcss-custom-properties/-/postcss-custom-properties-6.3.1.tgz#5c52abde313d7ec9368c4abf67d27a656cba8b39"
+postcss-custom-properties@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-custom-properties/-/postcss-custom-properties-7.0.0.tgz#24dc4fbe6d6ed550ea4fd3b11204660e9ffa3b33"
   dependencies:
     balanced-match "^1.0.0"
     postcss "^6.0.18"
@@ -7349,24 +7417,37 @@ postcss-custom-selectors@^4.0.1:
     postcss "^6.0.1"
     postcss-selector-matches "^3.0.0"
 
-postcss-easy-import@^3.0.0:
+postcss-dir-pseudo-class@^3.0.0:
   version "3.0.0"
-  resolved "https://registry.yarnpkg.com/postcss-easy-import/-/postcss-easy-import-3.0.0.tgz#8eaaf5ae59566083d0cae98735dfd803e3ab194d"
+  resolved "https://registry.yarnpkg.com/postcss-dir-pseudo-class/-/postcss-dir-pseudo-class-3.0.0.tgz#31a18af3b9b1b33be635599b998a9829896c3fed"
   dependencies:
-    globby "^6.1.0"
-    is-glob "^4.0.0"
-    lodash "^4.17.4"
-    object-assign "^4.0.1"
-    pify "^3.0.0"
-    postcss "^6.0.11"
-    postcss-import "^10.0.0"
-    resolve "^1.1.7"
+    postcss "^6.0.20"
+    postcss-selector-parser "^3.1.1"
 
-postcss-extend@^1.0.5:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/postcss-extend/-/postcss-extend-1.0.5.tgz#5ea98bf787ba3cacf4df4609743f80a833b1d0e7"
+postcss-extend-rule@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/postcss-extend-rule/-/postcss-extend-rule-1.1.0.tgz#11e4d590ffe4253b853ef1fc03be7167da607d38"
   dependencies:
-    postcss "^5.0.4"
+    postcss "^6.0.11"
+    postcss-nesting "^4.2.1"
+
+postcss-focus-visible@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-focus-visible/-/postcss-focus-visible-2.0.0.tgz#a6b9881f6710f6251790e2f151c94b161e23eeb6"
+  dependencies:
+    postcss "^6.0"
+
+postcss-font-family-system-ui@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-font-family-system-ui/-/postcss-font-family-system-ui-3.0.0.tgz#675fe7a9e029669f05f8dba2e44c2225ede80623"
+  dependencies:
+    postcss "^6.0"
+
+postcss-font-variant@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-font-variant/-/postcss-font-variant-3.0.0.tgz#08ccc88f6050ba82ed8ef2cc76c0c6a6b41f183e"
+  dependencies:
+    postcss "^6.0.1"
 
 postcss-html@^0.33.0:
   version "0.33.0"
@@ -7374,22 +7455,12 @@ postcss-html@^0.33.0:
   dependencies:
     htmlparser2 "^3.9.2"
 
-postcss-import@^10.0.0:
-  version "10.0.0"
-  resolved "https://registry.yarnpkg.com/postcss-import/-/postcss-import-10.0.0.tgz#4c85c97b099136cc5ea0240dc1dfdbfde4e2ebbe"
+postcss-initial@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-initial/-/postcss-initial-2.0.0.tgz#72715f7336e0bb79351d99ee65c4a253a8441ba4"
   dependencies:
-    object-assign "^4.0.1"
+    lodash.template "^4.2.4"
     postcss "^6.0.1"
-    postcss-value-parser "^3.2.3"
-    read-cache "^1.0.0"
-    resolve "^1.1.7"
-
-postcss-js@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/postcss-js/-/postcss-js-1.0.1.tgz#ffaf29226e399ea74b5dce02cab1729d7addbc7b"
-  dependencies:
-    camelcase-css "^1.0.1"
-    postcss "^6.0.11"
 
 postcss-jsx@^0.33.0:
   version "0.33.0"
@@ -7421,6 +7492,12 @@ postcss-loader@^3.0.0:
     postcss-load-config "^2.0.0"
     schema-utils "^1.0.0"
 
+postcss-logical@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/postcss-logical/-/postcss-logical-1.1.1.tgz#bcabf0638d8aa747743b32bc52f9d90d4a3313d2"
+  dependencies:
+    postcss "^6.0.20"
+
 postcss-markdown@^0.33.0:
   version "0.33.0"
   resolved "https://registry.yarnpkg.com/postcss-markdown/-/postcss-markdown-0.33.0.tgz#2d0462742ee108c9d6020780184b499630b8b33a"
@@ -7442,16 +7519,6 @@ postcss-message-helpers@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/postcss-message-helpers/-/postcss-message-helpers-2.0.0.tgz#a4f2f4fab6e4fe002f0aed000478cdf52f9ba60e"
 
-postcss-mixins@^6.0.1:
-  version "6.2.0"
-  resolved "https://registry.yarnpkg.com/postcss-mixins/-/postcss-mixins-6.2.0.tgz#fa9d2c2166b2ae7745956c727ab9dd2de4b96a40"
-  dependencies:
-    globby "^6.1.0"
-    postcss "^6.0.13"
-    postcss-js "^1.0.1"
-    postcss-simple-vars "^4.1.0"
-    sugarss "^1.0.0"
-
 postcss-modules-extract-imports@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/postcss-modules-extract-imports/-/postcss-modules-extract-imports-1.2.0.tgz#66140ecece38ef06bf0d3e355d69bf59d141ea85"
@@ -7479,33 +7546,77 @@ postcss-modules-values@^1.3.0:
     icss-replace-symbols "^1.1.0"
     postcss "^6.0.1"
 
-postcss-nested@^2.0.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-2.1.2.tgz#04057281f9631fef684857fb0119bae04ede03c6"
+postcss-nested@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-3.0.0.tgz#cde40bd07a078565f3df72e2dc2665871c724852"
   dependencies:
-    postcss "^6.0.9"
-    postcss-selector-parser "^2.2.3"
+    postcss "^6.0.14"
+    postcss-selector-parser "^3.1.1"
 
-postcss-nesting@^4.0.1:
+postcss-nesting@^4.2.1:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/postcss-nesting/-/postcss-nesting-4.2.1.tgz#0483bce338b3f0828ced90ff530b29b98b00300d"
   dependencies:
     postcss "^6.0.11"
 
-postcss-partial-import@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/postcss-partial-import/-/postcss-partial-import-4.1.0.tgz#f6c3e78e7bbeda4d9dab96d360367b90b353f9a4"
+postcss-page-break@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-page-break/-/postcss-page-break-1.0.0.tgz#09a63b6e03db092d38569b33dcba42a343ace60b"
   dependencies:
-    glob "^7.1.1"
-    postcss-import "^10.0.0"
+    postcss "^6.0.16"
 
-postcss-property-lookup@^1.2.1:
-  version "1.2.1"
-  resolved "https://registry.yarnpkg.com/postcss-property-lookup/-/postcss-property-lookup-1.2.1.tgz#30450a1361b7aae758bbedd5201fbe057bb8270b"
+postcss-preset-env@^3.2.2:
+  version "3.5.0"
+  resolved "https://registry.yarnpkg.com/postcss-preset-env/-/postcss-preset-env-3.5.0.tgz#b3aae2c65e5b3fa61d735b70392fa758a665b785"
+  dependencies:
+    "@csstools/postcss-image-set-function" "^1.0.0"
+    browserslist "^3.2.4"
+    caniuse-lite "^1.0.30000823"
+    cssdb "^1.6.0"
+    postcss "^6.0.21"
+    postcss-apply "^0.9.0"
+    postcss-attribute-case-insensitive "^2.0.0"
+    postcss-color-hex-alpha "^3.0.0"
+    postcss-color-mod-function "^2.4.2"
+    postcss-color-rebeccapurple "^3.0.0"
+    postcss-color-rgb "^2.0.0"
+    postcss-custom-media "^6.0.0"
+    postcss-custom-properties "^7.0.0"
+    postcss-custom-selectors "^4.0.1"
+    postcss-dir-pseudo-class "^3.0.0"
+    postcss-focus-visible "^2.0.0"
+    postcss-font-family-system-ui "^3.0.0"
+    postcss-font-variant "^3.0.0"
+    postcss-initial "^2.0.0"
+    postcss-logical "^1.1.1"
+    postcss-media-minmax "^3.0.0"
+    postcss-nesting "^4.2.1"
+    postcss-page-break "^1.0.0"
+    postcss-pseudo-class-any-link "^4.0.0"
+    postcss-replace-overflow-wrap "^2.0.0"
+    postcss-selector-matches "^3.0.1"
+    postcss-selector-not "^3.0.1"
+
+postcss-property-lookup@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-property-lookup/-/postcss-property-lookup-2.0.0.tgz#c995d1df42a75420f2aea834c2cbe296b2c15922"
   dependencies:
     object-assign "^4.0.1"
-    postcss "^5.0.4"
-    tcomb "^2.5.1"
+    postcss "^6.0.6"
+    tcomb "^3.2.21"
+
+postcss-pseudo-class-any-link@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-pseudo-class-any-link/-/postcss-pseudo-class-any-link-4.0.0.tgz#9152a0613d3450720513e8892854bae42d0ee68e"
+  dependencies:
+    postcss "^6.0.1"
+    postcss-selector-parser "^2.2.3"
+
+postcss-replace-overflow-wrap@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-replace-overflow-wrap/-/postcss-replace-overflow-wrap-2.0.0.tgz#794db6faa54f8db100854392a93af45768b4e25b"
+  dependencies:
+    postcss "^6.0.1"
 
 postcss-reporter@^5.0.0:
   version "5.0.0"
@@ -7569,12 +7680,6 @@ postcss-selector-parser@^3.1.0, postcss-selector-parser@^3.1.1:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss-simple-vars@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/postcss-simple-vars/-/postcss-simple-vars-4.1.0.tgz#043248cfef8d3f51b3486a28c09f8375dbf1b2f9"
-  dependencies:
-    postcss "^6.0.9"
-
 postcss-styled@>=0.33.0, postcss-styled@^0.33.0:
   version "0.33.0"
   resolved "https://registry.yarnpkg.com/postcss-styled/-/postcss-styled-0.33.0.tgz#69be377584105a582fda7e4f76888e5b97eed737"
@@ -7603,7 +7708,7 @@ postcss@6.0.22, postcss@^6.0.8:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
-postcss@^5.0.10, postcss@^5.0.4, postcss@^5.0.5, postcss@^5.2.16:
+postcss@^5.0.5, postcss@^5.2.16:
   version "5.2.18"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-5.2.18.tgz#badfa1497d46244f6390f58b319830d9107853c5"
   dependencies:
@@ -7612,15 +7717,7 @@ postcss@^5.0.10, postcss@^5.0.4, postcss@^5.0.5, postcss@^5.2.16:
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
-postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.13, postcss@^6.0.14, postcss@^6.0.18, postcss@^6.0.20, postcss@^6.0.21, postcss@^6.0.3, postcss@^6.0.9:
-  version "6.0.21"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.21.tgz#8265662694eddf9e9a5960db6da33c39e4cd069d"
-  dependencies:
-    chalk "^2.3.2"
-    source-map "^0.6.1"
-    supports-color "^5.3.0"
-
-postcss@^6.0.23:
+postcss@^6, postcss@^6.0, postcss@^6.0.16, postcss@^6.0.19, postcss@^6.0.22, postcss@^6.0.23, postcss@^6.0.6:
   version "6.0.23"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.23.tgz#61c82cc328ac60e677645f979054eb98bc0e3324"
   dependencies:
@@ -7628,6 +7725,14 @@ postcss@^6.0.23:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
+postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.14, postcss@^6.0.18, postcss@^6.0.20, postcss@^6.0.21:
+  version "6.0.21"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.21.tgz#8265662694eddf9e9a5960db6da33c39e4cd069d"
+  dependencies:
+    chalk "^2.3.2"
+    source-map "^0.6.1"
+    supports-color "^5.3.0"
+
 postcss@^7.0.0, postcss@^7.0.2:
   version "7.0.2"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.2.tgz#7b5a109de356804e27f95a960bef0e4d5bc9bb18"
@@ -7654,26 +7759,17 @@ precinct@^4.2.0:
     module-definition "^2.2.4"
     node-source-walk "^3.3.0"
 
-precss@2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/precss/-/precss-2.0.0.tgz#7f567e3318e06d44c8fdbf9e58452e8358bf4b71"
+precss@3.1.2:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/precss/-/precss-3.1.2.tgz#c82c0aa4ca5fe1e879799d697db0fac6d15d23bc"
   dependencies:
-    postcss "^6.0.3"
-    postcss-advanced-variables "1.2.2"
+    postcss "^6.0.19"
+    postcss-advanced-variables "^2.3.3"
     postcss-atroot "^0.1.3"
-    postcss-color-function "^4.0.0"
-    postcss-custom-media "^6.0.0"
-    postcss-custom-properties "^6.1.0"
-    postcss-custom-selectors "^4.0.1"
-    postcss-extend "^1.0.5"
-    postcss-media-minmax "^3.0.0"
-    postcss-mixins "^6.0.1"
-    postcss-nested "^2.0.2"
-    postcss-nesting "^4.0.1"
-    postcss-partial-import "^4.1.0"
-    postcss-property-lookup "^1.2.1"
-    postcss-selector-matches "^3.0.1"
-    postcss-selector-not "^3.0.1"
+    postcss-extend-rule "^1.1.0"
+    postcss-nested "^3.0.0"
+    postcss-preset-env "^3.2.2"
+    postcss-property-lookup "^2.0.0"
 
 prelude-ls@~1.1.2:
   version "1.1.2"
@@ -7870,12 +7966,6 @@ rc@^1.1.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-read-cache@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/read-cache/-/read-cache-1.0.0.tgz#e664ef31161166c9751cdbe8dbcf86b5fb58f774"
-  dependencies:
-    pify "^2.3.0"
-
 read-pkg-up@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-1.0.1.tgz#9d63c13276c065918d57f002a57f40a1b643fb02"
@@ -8316,10 +8406,6 @@ ret@~0.1.10:
   version "0.1.15"
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
 
-rgb@~0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/rgb/-/rgb-0.1.0.tgz#be27b291e8feffeac1bd99729721bfa40fc037b5"
-
 right-align@^0.1.1:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/right-align/-/right-align-0.1.3.tgz#61339b722fe6a3515689210d24e14c96148613ef"
@@ -8529,6 +8615,12 @@ signale@^1.2.1:
     figures "^2.0.0"
     pkg-conf "^2.1.0"
 
+simple-swizzle@^0.2.2:
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/simple-swizzle/-/simple-swizzle-0.2.2.tgz#a4da6b635ffcccca33f70d17cb92592de95e557a"
+  dependencies:
+    is-arrayish "^0.3.1"
+
 sisteransi@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/sisteransi/-/sisteransi-0.1.0.tgz#2e6706ac427019b84e60f751d588d87920484f25"
@@ -8993,12 +9085,6 @@ stylus-lookup@^2.0.0:
     commander "^2.8.1"
     debug "^3.1.0"
 
-sugarss@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/sugarss/-/sugarss-1.0.1.tgz#be826d9003e0f247735f92365dc3fd7f1bae9e44"
-  dependencies:
-    postcss "^6.0.14"
-
 sugarss@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/sugarss/-/sugarss-2.0.0.tgz#ddd76e0124b297d40bf3cca31c8b22ecb43bc61d"
@@ -9110,9 +9196,9 @@ tar@^4:
     safe-buffer "^5.1.1"
     yallist "^3.0.2"
 
-tcomb@^2.5.1:
-  version "2.7.0"
-  resolved "https://registry.yarnpkg.com/tcomb/-/tcomb-2.7.0.tgz#10d62958041669a5d53567b9a4ee8cde22b1c2b0"
+tcomb@^3.2.21:
+  version "3.2.27"
+  resolved "https://registry.yarnpkg.com/tcomb/-/tcomb-3.2.27.tgz#f4928bfc536b959d21a47e5f5f1ca2b2e4b7188a"
 
 term-size@^1.2.0:
   version "1.2.0"
@@ -9654,9 +9740,9 @@ validate-npm-package-license@^3.0.1:
     spdx-correct "^3.0.0"
     spdx-expression-parse "^3.0.0"
 
-vant-doc@1.0.14:
-  version "1.0.14"
-  resolved "https://registry.yarnpkg.com/vant-doc/-/vant-doc-1.0.14.tgz#c7f259e5b535b140a7025c6b5397611430551199"
+vant-doc@1.0.15:
+  version "1.0.15"
+  resolved "https://registry.yarnpkg.com/vant-doc/-/vant-doc-1.0.15.tgz#2abed8c5408a027098490ef66d978f60ba43d483"
   dependencies:
     cheerio "0.22.0"
     commander "^2.17.1"
@@ -9786,9 +9872,9 @@ vue-lazyload@1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/vue-lazyload/-/vue-lazyload-1.2.3.tgz#901f9ec15c7e6ca78781a2bae4a343686bdedb2c"
 
-vue-loader@^15.4.0:
-  version "15.4.0"
-  resolved "https://registry.yarnpkg.com/vue-loader/-/vue-loader-15.4.0.tgz#8c90f94ece61c6b4707e87b4a58617f97faa125b"
+vue-loader@^15.4.1:
+  version "15.4.1"
+  resolved "https://registry.yarnpkg.com/vue-loader/-/vue-loader-15.4.1.tgz#10c2da6f50ce5fc6bff2317dcbd1dccf4b3c7702"
   dependencies:
     "@vue/component-compiler-utils" "^2.0.0"
     hash-sum "^1.0.2"
@@ -9965,9 +10051,9 @@ webpack-sources@^1.0.1, webpack-sources@^1.1.0:
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@^4.16.5:
-  version "4.16.5"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.16.5.tgz#29fb39462823d7eb8aefcab8b45f7f241db0d092"
+webpack@^4.17.1:
+  version "4.17.1"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.17.1.tgz#0f026e3d823f3fc604f811ed3ea8f0d9b267fb1e"
   dependencies:
     "@webassemblyjs/ast" "1.5.13"
     "@webassemblyjs/helper-module-context" "1.5.13"