html,
body, main {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100vh;
  text-align: center;
  align-items: center;
  object-fit: contain;
  overflow: hidden;
  background-color: black;
}

canvas {
  background-color: black;
  max-width: 100%;
  max-height: 100vh;
  object-fit: scale-down;
}