diff --git a/ui/jquery.ui.dialog.js b/ui/jquery.ui.dialog.js
index ae96b2d..932f392 100644
--- a/ui/jquery.ui.dialog.js
+++ b/ui/jquery.ui.dialog.js
@@ -706,11 +706,7 @@ $.extend($.ui.dialog.overlay, {
 		}
 
 		var $el = (this.oldInstances.pop() || $('<div></div>').addClass('ui-widget-overlay'))
-			.appendTo(document.body)
-			.css({
-				width: this.width(),
-				height: this.height()
-			});
+			.appendTo(document.body);
 
 		if ($.fn.bgiframe) {
 			$el.bgiframe();