html, body {
  width: 100%;
  height: 100%;
  font-size: 16px;
}
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
}

canvas {
  max-width: 100%; 
  max-height: 100%;
  width: auto !important;
  height: 100% !important;
  object-fit: cover;
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);

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