html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #0d0a12;
}
#game {
  display: block;
  width: 100vw;
  height: 100vh;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
  cursor: grab;
}
#game:active { cursor: grabbing; }