diff --git a/app/assets/stylesheets/common/base/onebox.scss b/app/assets/stylesheets/common/base/onebox.scss
index 1ca4e635e..3a03617d5 100644
--- a/app/assets/stylesheets/common/base/onebox.scss
+++ b/app/assets/stylesheets/common/base/onebox.scss
@@ -157,7 +157,6 @@ pre.onebox code ol.lines li:before {
   display:inline-block;
   width:35px;
   left: -40px;
-  background: dark-light-choose(#F7F7F7, #070707);
   color:#AFAFAF;
   text-align:right;
   padding-right:5px;