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dabblet.css

div
{
	position: relative;

	width: 400px;
	height: 400px;
	
	border: 1px solid red;
}

div div
{
	position: absolute;
	left: 0;
	top: 0;
	bottom: 0;
	right: 0;
	margin: auto;
	width: 10px;
	height: 10px;
	background: red;
}

dabblet.html

<div><div></div></div>

settings.json

{"view":"separate","fontsize":"100","seethrough":"","prefixfree":"1","page":"all"}