diff --git a/app/assets/stylesheets/common/base/pagedown.scss b/app/assets/stylesheets/common/base/pagedown.scss
index 9de92d9715f..ec26be9829b 100644
--- a/app/assets/stylesheets/common/base/pagedown.scss
+++ b/app/assets/stylesheets/common/base/pagedown.scss
@@ -19,6 +19,7 @@
   margin-top: 5px;
   padding: 0;
   height: 20px;
+  overflow: hidden;
 }
 
 .wmd-spacer {