body{max-width:720px;margin:40px auto;padding:0 20px;font:16px/1.6 -apple-system,Segoe UI,Roboto,sans-serif;color:#1a1a1a}
h1{font-size:26px}h2{font-size:19px;margin-top:28px}
footer{margin-top:40px;color:#777;font-size:14px}