body{background:#0f0f0f;color:#f1f1f1;font-family:sans-serif;text-align:center;padding:2rem}button{padding:10px 20px;background:#00d084;border:none;color:#fff;font-weight:700;cursor:pointer;margin:1rem}.card{background:#1c1c1c;padding:1rem;margin-top:1rem;border-radius:10px}