html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #060d1a;
}

#game {
  display: block;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}