ddprrt/dabblet.css

## dabblet.css
/**
 * The first commented line is your dabblet’s title
 */

#bg {
	position:fixed;
	top:-50%;
	left:-50%;
	width:200%;
	height:200%;
}

#bg img {
	position:absolute;
	top:0;
	left:0;
	right:0;
	bottom:0;
	margin:auto;
	min-width:50%;
	min-height:50%;
}

## dabblet.html
<!-- content to be placed inside <body>…</body> -->
<div id="bg">
	<img src="http://www.silhouette.com/_media/img/home/bild_gross_1600x1080px.jpg" />
</div>

## settings.json
{"view":"separate","prefixfree":"1","page":"result"}
	/**
	* The first commented line is your dabblet’s title
	*/

	#bg {
	position:fixed;
	top:-50%;
	left:-50%;
	width:200%;
	height:200%;
	}

	#bg img {
	position:absolute;
	top:0;
	left:0;
	right:0;
	bottom:0;
	margin:auto;
	min-width:50%;
	min-height:50%;
	}
	<!-- content to be placed inside <body>…</body> -->
	<div id="bg">
	<img src="http://www.silhouette.com/_media/img/home/bild_gross_1600x1080px.jpg" />
	</div>