diff --git a/war/src/main/less/base/style.less b/war/src/main/less/base/style.less
index 1a7f7a97481f..962339e140aa 100644
--- a/war/src/main/less/base/style.less
+++ b/war/src/main/less/base/style.less
@@ -449,6 +449,7 @@ div.behavior-loading {
 .bottom-sticker,
 #bottom-sticker {
     width: 100%;   /* it needs to occupy the entire width or else the underlying content will see through */
+    z-index: 999;
 }
 
 .bottom-sticker-inner {