diff --git a/src/components/Layout/Header.less b/src/components/Layout/Header.less
index 5e5f7f6..b984cd3 100644
--- a/src/components/Layout/Header.less
+++ b/src/components/Layout/Header.less
@@ -14,6 +14,7 @@
   justify-content: space-between;
   height: 47px;
   background-color: #fff;
+  z-index: 999;
 
   .rightWarpper {
     display: flex;