:root{color:#17202a;background:#f8fafc;font-family:system-ui,sans-serif}body{margin:0}main{max-width:960px;margin:0 auto;padding:1.5rem}header{justify-content:space-between;align-items:center;gap:2rem;display:flex}nav{gap:1rem;display:flex}a{color:#155e75}section{max-width:52rem;margin-top:5rem}button{color:#fff;cursor:pointer;background:#155e75;border:0;border-radius:.5rem;padding:.7rem 1rem}article{background:#fff;border:1px solid #cbd5e1;border-radius:.5rem;padding:1rem}footer{color:#64748b;margin-top:5rem;font-size:.8rem}