diff --git a/src/librustdoc/html/static/css/themes/ayu.css b/src/librustdoc/html/static/css/themes/ayu.css
index b25f5e9fdb10..d834a957dd50 100644
--- a/src/librustdoc/html/static/css/themes/ayu.css
+++ b/src/librustdoc/html/static/css/themes/ayu.css
@@ -496,21 +496,10 @@ a.result-keyword:focus {}
 .sidebar a.current.keyword {}
 
 @media (max-width: 700px) {
-	.sidebar-menu {
-		background-color: #14191f;
-		border-bottom-color: #5c6773;
-		border-right-color: #5c6773;
-	}
-
 	.sidebar-elems {
 		background-color: #14191f;
 		border-right-color: #5c6773;
 	}
-
-	#sidebar-filler {
-		background-color: #14191f;
-		border-bottom-color: #5c6773;
-	}
 }
 
 kbd {
diff --git a/src/librustdoc/html/static/css/themes/dark.css b/src/librustdoc/html/static/css/themes/dark.css
index 184d0e77a90b..6ad73f309ea1 100644
--- a/src/librustdoc/html/static/css/themes/dark.css
+++ b/src/librustdoc/html/static/css/themes/dark.css
@@ -356,21 +356,10 @@ pre.ignore:hover, .information:hover + pre.ignore {
 }
 
 @media (max-width: 700px) {
-	.sidebar-menu {
-		background-color: #505050;
-		border-bottom-color: #e0e0e0;
-		border-right-color: #e0e0e0;
-	}
-
 	.sidebar-elems {
 		background-color: #505050;
 		border-right-color: #000;
 	}
-
-	#sidebar-filler {
-		background-color: #505050;
-		border-bottom-color: #e0e0e0;
-	}
 }
 
 kbd {
diff --git a/src/librustdoc/html/static/css/themes/light.css b/src/librustdoc/html/static/css/themes/light.css
index c6ba13fe1d6f..1efc9d3c4fa5 100644
--- a/src/librustdoc/html/static/css/themes/light.css
+++ b/src/librustdoc/html/static/css/themes/light.css
@@ -339,21 +339,10 @@ pre.ignore:hover, .information:hover + pre.ignore {
 }
 
 @media (max-width: 700px) {
-	.sidebar-menu {
-		background-color: #F5F5F5;
-		border-bottom-color: #e0e0e0;
-		border-right-color: #e0e0e0;
-	}
-
 	.sidebar-elems {
 		background-color: #F5F5F5;
 		border-right-color: #000;
 	}
-
-	#sidebar-filler {
-		background-color: #F5F5F5;
-		border-bottom-color: #e0e0e0;
-	}
 }
 
 kbd {