diff --git a/packages/vant-css/src/button.css b/packages/vant-css/src/button.css
index 7a3356dd1..8416fa779 100644
--- a/packages/vant-css/src/button.css
+++ b/packages/vant-css/src/button.css
@@ -15,10 +15,10 @@
   &::before {
     content: " ";
     position: absolute;
-    top: 0;
-    left: 0;
-    right: 0;
-    bottom: 0;
+    top: -1px;
+    left: -1px;
+    right: -1px;
+    bottom: -1px;
     opacity: 0;
     background-color: $black;
     border-radius: inherit; /* inherit parent's border radius */