body { background-color: rgba(42, 42, 46, 1); text-align: center; -moz-user-select: none; -webkit-user-select: none; -ms-user-select: none; user-select: none; } #board { position: relative; background-color: #111; width: 640px; height: 480px; margin: auto; border: 5px solid whitesmoke; }