html, body {
  margin: 0;
  padding: 0;
  
}
  main {

    text-align: center;

    width: 100%;
}
canvas {
  display: block;
}
main {

  align-items: center;

  display: flex;

  height: 100vh;

  justify-content: center;

}

main canvas { 

  height: auto !important;

  width: auto !important;

  max-width: 100%;

  max-height: 100%;

  display:

  margin: 0 auto;

  vertical-align: middle;

  touch-action: none;

}