html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: #0d1512;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}
canvas { display: block; position: absolute; left: 0; top: 0; }