index.html

<!doctype html>
<meta charset="utf-8">
<title>Via Morpha</title>
<script src="third-party/phaser.min.js"></script>
<style>
body {
	background-color:#000;
	margin: 0;
}

iframe {
	height:720px;
	width:1280px;
	border:0px;
	margin:auto;
	position:relative;
	display:block;
}

div {
position:fixed !important;
position:absolute;
top:0;
right:0;
bottom:0;
left:0;
}

canvas{
    top: 0px;
    position: absolute;
    right: 0px;
}
</style>
<body>

<iframe src="menu.html" id="game"></iframe>

<script src="src/bgmusic.js"></script>
<script>
function shift()
            {
                var heights = window.innerHeight;
                document.getElementById("game").style.top = (heights-720)/2 + "px";
            }
            shift();
            window.onresize = function() {
                shift();
            };

</script>