.app{text-align:center;padding:2rem;font-family:Arial,sans-serif}button{margin-top:1rem;padding:.6rem 1.2rem;font-size:1rem;border-radius:8px;border:none;background-color:#646cff;color:#fff;cursor:pointer}button:hover{background-color:#535bf2}body{margin:0;padding:0;font-family:Arial,sans-serif;background:#f9f9f9}