diff --git a/public/css/icinga/layout-structure.less b/public/css/icinga/layout-structure.less
index 745075faf..cd3271431 100644
--- a/public/css/icinga/layout-structure.less
+++ b/public/css/icinga/layout-structure.less
@@ -105,6 +105,7 @@ html {
   top: 0;
   background-color: white;
   padding: 0;
+  z-index: 100;
 }
 
 .controls h1 {