diff --git a/app/assets/stylesheets/desktop/topic-timeline.scss b/app/assets/stylesheets/desktop/topic-timeline.scss
index ab2afb22325..df33bfbea91 100644
--- a/app/assets/stylesheets/desktop/topic-timeline.scss
+++ b/app/assets/stylesheets/desktop/topic-timeline.scss
@@ -10,7 +10,7 @@
 
 .timeline-container {
   box-sizing: border-box;
-  z-index: 999;
+  z-index: 499;
   margin-left: 757px;
 
   @media all and (min-width: 1140px) {