html {
  background: #fff;
  color: #111;
  font: 100%/1.5 Arial, Helvetica, sans-serif;
}

body {
  max-width: 52em;
  margin: 0 auto;
  padding: 1em;
}

body > a {
  position: absolute;
  left: -9999px;
}

body > a:focus {
  position: static;
}

body > header {
  margin: 1em 0 2em;
  padding-bottom: 1em;
  border-bottom: 1px solid #999;
}

body > header small,
article small {
  display: block;
}

nav {
  margin: 1em 0;
}

nav a {
  margin-right: 1em;
}

main > header,
main > section,
main > article,
section > article {
  margin: 2em 0;
}

section > article {
  padding-bottom: 1em;
  border-bottom: 1px solid #bbb;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

a {
  color: #0000cc;
}

code,
pre {
  font-family: "Courier New", Courier, monospace;
}

pre {
  overflow: auto;
  padding: 1em;
  border: 1px solid #999;
}

dl {
  margin: 1em 0;
}

dt {
  margin-top: 0.75em;
  font-weight: bold;
}

dd {
  margin-left: 2em;
}

aside {
  margin: 1em 0;
  padding: 1em;
  border-left: 3px solid #999;
}

footer {
  margin-top: 2em;
  border-top: 1px solid #999;
}