html, body {
  margin: 0;
  padding: 0;
  background-color: #000;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}
body {
  cursor: -webkit-grab;
}
canvas {
  display: block;
}
.hidden {
  display: none !important;
}