diff --git a/style/components/dialog/Dialog.less b/style/components/dialog/Dialog.less
index 46e3506f0a..b2b265f2a7 100644
--- a/style/components/dialog/Dialog.less
+++ b/style/components/dialog/Dialog.less
@@ -58,6 +58,7 @@
       line-height: 12px;
       top: 18px;
       right: 18px;
+      z-index: 1;
 
       &:before {
         content: "\e62d";