body {
  margin: 0;
  background: rgb(0, 0, 0);
}

main {
  height: 100vh;
  width: 100vw;

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

canvas {
  max-width: 100%;
  max-height: 100%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  object-fit: contain;
}