body,
html {
    height: 100%;
  	margin: 0;
	justify-content: center;	
	align-items: center;
	background: #000;
}
main {
	height: 100%;	
    display: flex;
	justify-content: center;	
	align-items: center;   
}
canvas {
	max-height:100%;
    max-width:100%;
}