Frosted glass effect with filters

dabblet.css

/**
 * Frosted glass effect with filters
 */

* { padding: 0; margin: 0 }
body, html { min-height: 100%; }

body, div:after {
	background: url('http://devslovebacon.com/images/bacon-bg.jpg') center;
}

div {
	position: absolute;
	top: 50%; left: 50%;
	width: 400px; height: 300px;
	margin: -150px 0 0 -200px;
	padding: 1em;
	border: 1px solid rgba(255,255,255,.5);
	border-radius: 10px;
	box-sizing: border-box;
	background: rgba(255,255,255,.2);
	font: 150%/1.6 sans-serif;
	text-align: center;
	box-shadow: -1px -1px 10px rgba(255,255,255,.3) inset,
		2px 2px 20px rgba(0,0,0,.5);
	text-shadow: 0 1px 1px rgba(255,255,255,.6);
}

div:after {
	content: '';
	position: absolute;
	top: 0; right: 0; bottom: 0; left: 0;
	z-index: -1;
	border-radius:inherit;
	-webkit-filter: blur(3px);
}

dabblet.html

<div>This is an overlay. 
The background behind this overlay <strong>only</strong>
should be blurred on Webkit nightlies. </div>

settings.json

{"view":"split-vertical","prefixfree":"1","page":"css"}