html, body {
  margin: 0;
  padding: 0;
}
main {
	text-align: center;
	width: 100%;
}
canvas {
  display: block;
  height: auto !important;
  width: auto !important;
  max-width: 100%;
  max-height: 100%;
  display: inline-block; 
  margin: 0 auto;
  vertical-align: middle;
  touch-action: none;
}