diff --git a/less/lib/App.less b/less/lib/App.less
index 8b4ebe4b9..d4bda7eaa 100755
--- a/less/lib/App.less
+++ b/less/lib/App.less
@@ -93,6 +93,7 @@
     }
     > .Button {
       color: @header-color;
+      width: 100%;
     }
   }
   .App-titleControl--text {