diff --git a/src/client/less/layout.less b/src/client/less/layout.less
index 719ec7b..f53a000 100644
--- a/src/client/less/layout.less
+++ b/src/client/less/layout.less
@@ -25,6 +25,7 @@ html, body {
     position: fixed;
     top: 0;
     right: 50%;
+    z-index: 10;
 
     .btn {
       margin: 5px (5px + 15px) 0 0; // 15px for scroll bar width