*{box-sizing:border-box}body{margin:0;background:#f2f7fb;color:#10263c;font:17px/1.6 system-ui,sans-serif}main{max-width:640px;margin:40px auto;padding:24px}section{background:#fff;border:1px solid #d9e5ef;border-radius:16px;padding:24px;margin:20px 0}a{color:#075c9a}section a{display:inline-block;padding:12px 20px;background:#0973c0;color:white;border-radius:10px;text-decoration:none}h1{font-size:30px}a[hidden]{display:none}