html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #0b1418;
  overflow: hidden;
  touch-action: none;
  overscroll-behavior: none;
  -webkit-user-select: none;
  user-select: none;
}

#game {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 8px;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.6);
}