body {
  font-family: -apple-system, system-ui, sans-serif;
  line-height: 1.5;
  max-width: 40rem;
  margin: 0 auto;
  padding: 1rem;
  color: #111;
}
h1 {
  font-size: 1.5rem;
}
h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
}