body{font-family:Arial,Helvetica,sans-serif;margin:0;padding:0;color:#111}
header{background:#0077cc;color:#fff;padding:12px}
.center{max-width:420px;margin:60px auto;padding:20px;border:1px solid #eee;border-radius:6px}
input{display:block;width:100%;margin:8px 0;padding:10px;border:1px solid #ccc;border-radius:4px}
button{padding:10px 14px;border-radius:4px;border:none;background:#0077cc;color:#fff}
.card{border:1px solid #ddd;padding:10px;margin:6px;border-radius:6px}