body {
  font-family: Menlo, Consolas, "Courier New", monospace;
  background: #ffffff;
  color: #000000;
  max-width: 640px;
  margin: 3em auto;
  padding: 0 1em;
  line-height: 1.6;
  font-size: 15px;
}

h1 {
  font-size: 1.8em;
  margin-bottom: 0.3em;
}

h2 {
  font-size: 1.2em;
  margin-top: 1.6em;
  margin-bottom: 0.4em;
}

a {
  color: #0000ee;
}

a:visited {
  color: #551a8b;
}

ul {
  margin-top: 0.3em;
}