diff --git a/_static/custom.css b/_static/custom.css
index 3b407d32..a5a01f26 100644
--- a/_static/custom.css
+++ b/_static/custom.css
@@ -2,7 +2,6 @@ aside.sidebar:not(.margin),
 div.sidebar:not(.margin) {
   width:35%;
   padding: 10px;
-  background-color: #fff;
   margin: 0px;
 }
 aside.sidebar p.sidebar-title {