html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  font-size: 12px;
  color: #333333;
}

#mount canvas {
  /* border-right: 1px solid #aaaaaa40; */
  border: 1px solid #aaaaaa2a;
  background-image:
  linear-gradient(#aaaaaa2a 1px, transparent 0),
  linear-gradient(90deg, #aaaaaa2a 1px, transparent 0),
  linear-gradient(#aaaaaa4a 1px, transparent 0),
  linear-gradient(90deg, #aaaaaa4a 1px, transparent 0);
  background-size: 10px 10px, 10px 10px, 50px 50px, 50px 50px;
}