body {
  background-color: gray;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin: 0;
  padding: 0;
}
@media screen and (orientation: landscape) {
  canvas {
    max-height: 100vh !important;
    width: auto !important;
  }
}
@media screen and (orientation: portrait) {
  canvas {
    max-width: 100vw !important;
    height: auto !important;
  }
}