diff --git a/phpBB/styles/prosilver/theme/bidi.css b/phpBB/styles/prosilver/theme/bidi.css
index 7dfe58c667..4b28443969 100644
--- a/phpBB/styles/prosilver/theme/bidi.css
+++ b/phpBB/styles/prosilver/theme/bidi.css
@@ -788,15 +788,6 @@ li.breadcrumbs span:first-child > a {
 	float: right;
 }
 
-/* Responsive *CP navigation
-----------------------------------------*/
-@media only screen and (max-width: 900px), only screen and (max-device-width: 900px)
-{
-	.rtl .cp-menu, .rtl .navigation, .rtl .cp-main {
-		float: none;
-	}
-}
-
 /**
 * forms.css
 */