centering with absolute position

dabblet.css

/**
 * centering with absolute position
 */

div {
	width: 100px;
	height: 100px;
	background-color: red;

	position: absolute;
	top:0;
	bottom: 0;
	left: 0;
	right: 0;
	
	margin: auto;
}

dabblet.html

<div></div>

settings.json

{"view":"split-vertical","fontsize":"100","seethrough":"","prefixfree":"1","page":"all"}