diff --git a/common/lib/xmodule/xmodule/css/problem/edit.scss b/common/lib/xmodule/xmodule/css/problem/edit.scss
index 9f43db39e0..018a0961c2 100644
--- a/common/lib/xmodule/xmodule/css/problem/edit.scss
+++ b/common/lib/xmodule/xmodule/css/problem/edit.scss
@@ -29,7 +29,7 @@
 .simple-editor-cheatsheet {
   position: absolute;
   top: 41px;
-  left: 70%;
+  @include left(70%);
   width: 0;
   border-left: 1px solid $gray-l2;