diff --git a/kallithea/public/less/kallithea-diff.less b/kallithea/public/less/kallithea-diff.less
--- a/kallithea/public/less/kallithea-diff.less
+++ b/kallithea/public/less/kallithea-diff.less
@@ -188,6 +188,7 @@ BIN_FILENODE = 6
   border: 1px solid @kallithea-theme-main-color;
   border-radius: 3px;
   box-sizing: border-box;
+  overflow: hidden;
 }
 .add-bubble div:before {
   font-size: 14px;