body{font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;max-width:720px;margin:48px auto;padding:0 20px;line-height:1.6;color:#1a1a1a}
h1{font-size:1.8rem}h2{font-size:1.2rem;margin-top:1.6em}nav a{margin-right:16px}footer{margin-top:3em;font-size:.9rem;color:#555}