diff --git a/css/app.css b/css/app.css
index df0c7a4e4..7e7efa868 100644
--- a/css/app.css
+++ b/css/app.css
@@ -1497,7 +1497,7 @@ div.combobox {
 .additional-tags div.tag-help {
     float: left;
     width: 33.3333%;
-    width: -webkit-calc(100% - 40px);
+    width: -webkit-calc(100% + 40px);
     width: calc(100% + 40px);
 }