diff --git a/_media/custom.css b/_media/custom.css
index 71e94ad..773699e 100644
--- a/_media/custom.css
+++ b/_media/custom.css
@@ -1,25 +1,27 @@
- section.cover.has-mask .mask {
-  background-image: linear-gradient(hsla(0, 0%, 100%, 0.25),hsla(0, 0%, 100%, 0.25));
-  background-color: transparent;
-  opacity: 1;
-}  
- 
-section.cover h1 .anchor span{
-  font-family: 'Lobster', cursive;
-  color: var(--theme-color);
-
+section.cover .cover-main {
+    z-index: 100;
+}
+section.cover.has-mask .mask {
+    background-image: linear-gradient(hsla(0, 0%, 100%, 0.25), hsla(0, 0%, 100%, 0.25));
+    background-color: transparent;
+    opacity: 1;
 }
 
-section.cover h2 .anchor span{
-  font-family: 'Lobster', cursive;
-  font-size:24px;
-  color: var(--theme-color);
+section.cover h1 .anchor span {
+    font-family: 'Lobster', cursive;
+    color: var(--theme-color);
 }
 
-section.cover .cover-main>p:last-child a .iconfont {
-  font-size: 1em;
+section.cover h2 .anchor span {
+    font-family: 'Lobster', cursive;
+    font-size: 24px;
+    color: var(--theme-color);
 }
 
-.sidebar>h1 a {
-  font-family: 'Lobster', cursive;
+section.cover .cover-main > p:last-child a .iconfont {
+    font-size: 1em;
+}
+
+.sidebar > h1 a {
+    font-family: 'Lobster', cursive;
 }