body{font-family:Arial;background:#f4f7fb;padding:20px}
.card{max-width:420px;margin:auto;background:#fff;padding:20px;border-radius:20px;
box-shadow:0 10px 30px rgba(0,0,0,.1)}
input,button{width:100%;padding:12px;margin:8px 0}
button{background:#0d6efd;color:#fff;border:none;border-radius:10px}