Index: wp-includes/js/customize-preview.dev.js
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--- wp-includes/js/customize-preview.dev.js	(revision 20971)
+++ wp-includes/js/customize-preview.dev.js	(working copy)
@@ -122,3 +122,45 @@
 	});
 
 })( wp, jQuery );
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+jQuery(document).ready(function($){
+	var win = window.dialogArguments || opener || parent || top, h = document.body.scrollHeight, jq = win.jQuery;
+
+	jq('#customize-controls').css({
+		right: 'auto',
+		width: '25%',
+		position: 'fixed'
+	});
+
+	jq('#customize-preview').css({
+		position: 'relative',
+		left: '25%',
+		width: '75%'
+	});
+	
+	jq('#customize-preview iframe').css({
+		height: h + 'px',
+		overflow: 'hidden'
+	});
+	
+	jq('body').css({
+		position: 'static',
+		left: '0',
+		height: h + 'px',
+		'z-index': '0'
+	});
+});
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