body {
  max-width: 42em;
  margin: 2em auto;
  padding: 0 1em;
  line-height: 1.6;
  color: #04ff04;
  background: #000;
  font-family: monospace;
  font-size: 18px;
}

h1, h2, h3, h4 {
  color: #04ff04;
  margin-top: 1.5em;
}

a {
  color: yellow;
  text-decoration: underline;
}

a:hover {
  text-decoration: underline;
}

hr { border-color: green; }