diff --git a/less/common/App.less b/less/common/App.less
index 331af8f16c..faafe7f01b 100644
--- a/less/common/App.less
+++ b/less/common/App.less
@@ -231,7 +231,8 @@
     .header-background();
     padding: 8px;
     position: absolute;
-   
+    border-bottom: 0;
+
     .affix & {
       position: fixed;
     }