body {
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
  max-width: 40rem;
  margin: 3rem auto;
  padding: 0 1rem;
  color: #1a1a1a;
  line-height: 1.5;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #ddd;
  font-size: 0.8rem;
  color: #666;
}