body {
  font:
    16px/1.5 system-ui,
    sans-serif;
  max-width: 40rem;
  margin: 0 auto;
  padding: 2rem 1rem;
}
main,
footer {
  padding: 1.5rem;
  border: 1px solid #ccc;
  border-radius: 8px;
}
footer {
  margin-top: 1rem;
}
h2 {
  font-size: 1rem;
  margin: 0 0 1rem;
  font-weight: 600;
}