eyeofmidas.com/htdocs/canvas/gravitywell/index.html

<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style type="text/css">
html,body{
	margin: 0;
	padding: 0;
	font-family: Arial, sans-serif;
}
#game-container {
	width: 100%;
	height: 100%;
	z-index: 1;
}
</style>
<div id="game-container"></div>
<script type="text/javascript" src="all.min.js"></script>
<script type="text/javascript">
document.addEventListener("DOMContentLoaded", function(event) {
	window.system = new System();
	system.create("game-container", new GravityWellGame(), "#000000");
});
</script>