body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background: #111;
  color: #eee;
}

header {
  background: #222;
  padding: 2em;
  text-align: center;
}

main {
  max-width: 800px;
  margin: 2em auto;
  padding: 0 1em;
}

section {
  margin-bottom: 2em;
}

footer {
  text-align: center;
  padding: 1em;
  background: #222;
  color: #888;
  font-size: 0.9em;
}