body{max-width:640px;margin:48px auto;padding:0 20px;font:17px/1.55 -apple-system,Helvetica,Arial,sans-serif;color:#111;background:#fff}
h1{font-size:28px;margin-bottom:4px}h2{font-size:19px;margin-top:32px}
a{color:#111}nav{font-size:14px;margin-bottom:32px;color:#666}nav a{margin-right:16px}