html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  background: black;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-width: 100vw;
  background: black;
}

canvas {
  display: block;
  max-width: 100vw;
  max-height: 100vh;
  margin: auto;
  touch-action: manipulation;
}