body {
	background-color: black;
	color: white;
}

.app {
	position: absolute;
	width: 900px;
	height: 600px;
	top: 50%;
	left: 50%;
	margin-left: -450px;
	margin-top: -300px;
	background-color: white;
}

h1 {
	text-align: center;
}