diff --git a/frontend/resources/styles/main/partials/viewer.scss b/frontend/resources/styles/main/partials/viewer.scss
index 0a774646f6..00a0c14bcd 100644
--- a/frontend/resources/styles/main/partials/viewer.scss
+++ b/frontend/resources/styles/main/partials/viewer.scss
@@ -164,6 +164,7 @@
     top: 50px;
     width: 256px;
     height: 100%;
+    z-index: 10;
   }
 }