html,
body {
  overflow: hidden;
  margin: 0;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  margin: auto auto;
  max-width: 95vmin;
  max-height: 95vmin;
  /* border: 1px solid red; */
  /* 
      image-rendering: -moz-crisp-edges;
  image-rendering: -webkit-crisp-edges;
  image-rendering: pixelated;
  image-rendering: crisp-edges; */
}