html,
body,
main {
  height: 100%;
  width: 100%;
  margin: 0;
  background: #222222;
  overflow: hidden;
}

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

canvas {
  height: auto;
  width: auto;
  max-width: 100%;
  max-height: 100%;
}

canvas {
  max-width: 100%;
  max-height: 100%;
  margin: auto;
  overflow: auto;
  position: fixed;
  object-fit: contain;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}