body {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: #111;
}

a {
  color: #0055aa;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

header, footer {
  margin-bottom: 2rem;
}