diff --git a/app/css/app.css b/app/css/app.css
index db1186d1..42c61ad8 100644
--- a/app/css/app.css
+++ b/app/css/app.css
@@ -1078,7 +1078,7 @@ div.im_message_video_thumb {
 
 .im_message_iframe_video {
     position: relative;
-    padding-bottom: 56.25%; // 16/9 ratio
+    padding-bottom: 56.25%; /* 16/9 ratio */
     height: 0;
     overflow: hidden;
     margin-top: 5px;