body {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem;
  font-family: -apple-system, system-ui, sans-serif;
  line-height: 1.6;
  color: #222;
}

header nav {
  margin-bottom: 2rem;
}

a {
  color: #0b5fff;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #eee;
  font-size: 0.85rem;
  color: #888;
}