diff --git a/asset/css/markbind.css b/asset/css/markbind.css
index b38ecfa195..efb7784892 100644
--- a/asset/css/markbind.css
+++ b/asset/css/markbind.css
@@ -94,7 +94,7 @@ code.hljs:hover {
 header.header-fixed {
     position: fixed;
     width: 100%;
-    z-index: 9999;
+    z-index: 1000;
 }
 
 /* #app is treated as the main container */