* {
  -webkit-user-select: none;
  user-select: none;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  margin: 0;
  padding: 0;
}

#game {
  width: 840px;
  height: 480px;
  margin: 0 auto;
}