body{background:#fff;color:#222;font-family:sans-serif}#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}@media (prefers-color-scheme:dark){body{background:#181a1b;color:#e0e0e0}#refreshButton{background-color:#2e7d32;color:#fff}#matrix span{border:1px solid #444;background:#23272a;color:#e0e0e0}}