body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  max-width:42rem;
  margin:3rem auto;
  line-height:1.6;
  padding:0 1rem;
}
h1,h2{font-weight:600;margin:0 0 .5rem}
h1{font-size:1.75rem}
h2{font-size:1.25rem}
a{color:#0366d6;text-decoration:none}
a:hover{text-decoration:underline}
nav{margin:.5rem 0 1.5rem}
hr{border:none;border-top:1px solid #e5e5e5;margin:2rem 0}
ul{list-style:none;padding:0}
ul li{margin:.25rem 0}
article time{color:#666;font-size:.9rem}