diff --git a/packages/vant-css/src/button.css b/packages/vant-css/src/button.css
index 1fd62f0e8..7dbd1050f 100644
--- a/packages/vant-css/src/button.css
+++ b/packages/vant-css/src/button.css
@@ -21,8 +21,8 @@
     width: 100%;
     height: 100%;
     border: inherit;
-    border-color: #000;
-    background-color: #000;
+    border-color: $black;
+    background-color: $black;
     border-radius: inherit;/* inherit parent's border radius */
     transform: translate3d(-50%, -50%, 0); 
   }