diff --git a/src/librustdoc/html/static/themes/dark.css b/src/librustdoc/html/static/themes/dark.css
index 52a30967a231..6935ecde791f 100644
--- a/src/librustdoc/html/static/themes/dark.css
+++ b/src/librustdoc/html/static/themes/dark.css
@@ -410,10 +410,6 @@ kbd {
 	color: #ccc;
 }
 
-.impl-items code {
-	background-color: rgba(0, 0, 0, 0);
-}
-
 #sidebar-toggle {
 	background-color: #565656;
 }
diff --git a/src/librustdoc/html/static/themes/light.css b/src/librustdoc/html/static/themes/light.css
index d20fea666e61..306e8dc15d89 100644
--- a/src/librustdoc/html/static/themes/light.css
+++ b/src/librustdoc/html/static/themes/light.css
@@ -405,10 +405,6 @@ kbd {
 	color: #999;
 }
 
-.impl-items code {
-	background-color: rgba(0, 0, 0, 0);
-}
-
 #sidebar-toggle {
 	background-color: #F1F1F1;
 }