body{margin:0;font-family:Arial,sans-serif;background:#f5f5f5}.container{text-align:center;padding:20px}.container.dark{background:#121212;color:#fff}.cards{display:flex;justify-content:center;gap:20px;margin:20px 0}.cards div{background:#fff;padding:15px;border-radius:10px}table{width:100%;margin-top:20px;border-collapse:collapse}th,td{border:1px solid gray;padding:8px}