*{box-sizing:border-box}body{margin:0;background:#f4f6f8;color:#243b4c;font:16px Arial,sans-serif;min-height:100vh;display:grid;place-items:center}main{background:white;width:min(420px,92vw);padding:36px;border-radius:20px;box-shadow:0 12px 44px #22334412}h1{margin:18px 0 8px}p{color:#64748b;line-height:1.5}.mark{background:#243b4c;color:white;padding:10px 16px;border-radius:12px;font-size:24px}label{display:block;margin:20px 0 8px}input{display:block;width:100%;border:1px solid #ccd5df;border-radius:9px;padding:12px;font:inherit;margin-top:8px}button{width:100%;border:0;border-radius:9px;background:#243b4c;color:white;padding:13px;font:inherit;cursor:pointer}#error{color:#b42318;font-size:14px}