diff --git a/framework/core/less/common/App.less b/framework/core/less/common/App.less
index 331af8f16..faafe7f01 100644
--- a/framework/core/less/common/App.less
+++ b/framework/core/less/common/App.less
@@ -231,7 +231,8 @@
     .header-background();
     padding: 8px;
     position: absolute;
-   
+    border-bottom: 0;
+
     .affix & {
       position: fixed;
     }