Rollup merge of #40725 - Cldfire:master, r=estebank

Remove duplicated styling in main.css

If nothing else, it saves a bit of data.

Author: GuillaumeGomez

src/librustdoc/html/static/styles/main.css

@@ -45,14 +45,6 @@ pre {
 	background-color: #fff;
 }
 
-.sidebar {
-    background-color: #F1F1F1;
-}
-
-.sidebar .current {
-    background-color: #fff;
-}
-
 .sidebar .location {
 	border-color: #000;
 	background-color: #fff;