#refreshButton{position:fixed;bottom:10px;right:10px;padding:5px 10px;font-size:16px;background-color:#4caf50;color:#fff;border:none;border-radius:5px;cursor:pointer}#matrix span{display:inline-block;width:30px;height:30px;margin:2px;border:1px solid #888;font-size:18px;text-align:center;background:#f9f9f9}