body{font-family:Arial,sans-serif;background-color:#add8e6;color:#000;transition:1s}header{display:flex;justify-content:space-between;align-items:center;padding:10px;background-color:#6e6e6e}.switch{position:relative;display:inline-block;width:60px;height:34px}.switch input{opacity:0;width:0;height:0}.slider{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background-color:#ccc;-webkit-transition:.4s;transition:.4s}.slider:before{position:absolute;content:"";height:26px;width:26px;left:4px;bottom:4px;background-color:#fff;-webkit-transition:.4s;transition:.4s}input:checked+.slider{background-color:#a9a9a9}input:focus+.slider{box-shadow:0 0 1px #2196f3}input:checked+.slider:before{-webkit-transform:translateX(26px);-transform:translateX(26px)}.slider.round{border-radius:34px}.slider.round:before{border-radius:50%}table{margin:20px auto;border-collapse:collapse}td{width:100px;height:100px;text-align:center;vertical-align:middle;border:1px solid #000;font-size:60px}#gameResult{font-size:22px;font-weight:700;text-align:center;margin-top:20px}.dark-mode{background-color:#000;color:#fff}.dark-mode td{border-color:#fff;color:inherit}