body{font-family:system-ui,sans-serif;margin:0;display:grid;place-items:center;min-height:100vh;background:#0b1220;color:#eef}
main{text-align:center;padding:2rem}button{font-size:1.1rem;padding:.8rem 1.6rem;border-radius:999px;border:0;background:#3b82f6;color:#fff;cursor:pointer}
button[hidden]{display:none}.row{margin:1rem 0;display:flex;gap:1rem;justify-content:center}