body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:#f5f5f5;margin:0;padding:20px;display:flex;justify-content:center}.App{max-width:600px;width:100%}.card{background-color:#fff;border-radius:10px;padding:20px;margin-bottom:15px;box-shadow:0 4px 8px #0000001a}.card h2{font-size:1.2rem;margin-bottom:15px}button{padding:10px 20px;margin-right:10px;font-size:1rem;border:none;border-radius:6px;cursor:pointer;background-color:#007bff;color:#fff;transition:background-color .2s ease}button:hover{background-color:#0056b3}.correct{color:green;font-weight:700}.wrong{color:red;font-weight:700}