style.css

html,
body {
	margin: 0;
	padding: 0;
	width:  100%;
	height: 100%;
}
body {
	position: fixed;
	top: 0;
    left: 0;
	text-align: center;

	/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#47428d+0,96a5cf+100 */
	background: #47428d; /* Old browsers */
	background: -moz-linear-gradient(top, #47428d 0%, #96a5cf 100%); /* FF3.6-15 */
	background: -webkit-linear-gradient(top, #47428d 0%,#96a5cf 100%); /* Chrome10-25,Safari5.1-6 */
	background: linear-gradient(to bottom, #47428d 0%,#96a5cf 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
	filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#47428d', endColorstr='#96a5cf',GradientType=0 ); /* IE6-9 */
}
canvas {
	width:  100%;
	height: 100%;
}
@media only screen and (min-width : 320px) and (max-width : 480px) {
	body {
		background: #47428d;
	}
}