html,
body {
  background: #000;
  margin: 0;
  padding: 0;
}

main {
  height: 100vh;
  width: 100%;
  display: flex;
  justify-content: center;
  text-align: center;
  align-items: center;
}
main canvas {
  vertical-align: middle;
  touch-action: none;
  height: auto !important;
  width: auto !important;
  max-width: 100%;
  max-height: 100%;
  display: inline-block;
  margin: 0 auto;
}
canvas {
  display: block;
}