body {
  background-color: #000;

  margin:0;
	
  display:flex;
	align-items:center;
	justify-content:center;

	width:100vw;
	height:100vh;

  /* leave it to hide the scrollbars */
  overflow: hidden;
}
canvas{
  position:fixed;
  z-index:1;
  height:100vh;
}