:root{color:#1f2937;background:#f3f4f6;font-family:system-ui,sans-serif}main{background:#fff;border:1px solid #d1d5db;border-radius:8px;max-width:720px;margin:15vh auto;padding:2rem}h1{margin-top:0;font-size:2rem}p{font-size:1.1rem}