Index: src/wp-admin/css/customize-controls.css
===================================================================
--- src/wp-admin/css/customize-controls.css	(revision 36591)
+++ src/wp-admin/css/customize-controls.css	(working copy)
@@ -709,10 +709,6 @@
 	position: relative;
 }
 
-.ios #customize-preview {
-	position: relative;
-}
-
 .ios #customize-controls .wp-full-overlay-sidebar-content {
 	-webkit-overflow-scrolling: touch;
 }