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dabblet.css

div.container {
	width: 100%;
	height: 100%;
	background-color: white;
	color: white;
	display: flex;
	align-items: center;
	justify-content: center;
}

html,body { height: 100%; margin: 0px; padding: 0px; }

div.center {
	background-color: black;
}

dabblet.html

<div class='container'>
<div class='center'><p>sfds</p></div>
</div>

settings.json

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