html, body {
  width: 100%;
  height: 100%;
  font-size: 16px;
}
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #111;
}

canvas {
  max-width: 100%; 
  max-height: 100%;
  width: auto !important;
  /* height: auto !important; */
  height: 100% !important;
  object-fit: contain;

  /* disable double tap to zoom */
  touch-action: manipulation;
}