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

table {
  position: absolute;
  top: 0;
  left: 0;
  font-size: 1px;
}

#container {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -240px 0 0 -240px;
  width: 480px;
  height: 480px;
}