diff --git a/packages/components/side-bar/side-bar.less b/packages/components/side-bar/side-bar.less
index 5b099fc74..7bf71881e 100644
--- a/packages/components/side-bar/side-bar.less
+++ b/packages/components/side-bar/side-bar.less
@@ -18,5 +18,7 @@
   &__padding {
     flex: 1;
     background-color: @side-bar-bg-color;
+    position: relative;
+    z-index: 2;
   }
 }