diff --git a/app/assets/stylesheets/desktop/topic-post.scss b/app/assets/stylesheets/desktop/topic-post.scss
index e869ad4dfd2..fb7f0ac4beb 100644
--- a/app/assets/stylesheets/desktop/topic-post.scss
+++ b/app/assets/stylesheets/desktop/topic-post.scss
@@ -536,6 +536,7 @@ video {
 
   .topic-header-extra {
     margin: 0 0 0 5px;
+    flex: 1 1 90%;
   }
 }