body {
  max-width: 900px;
  margin: auto;
  padding: 2rem;
  font-family: system-ui, sans-serif;
  line-height: 1.6;
}

nav {
  margin-bottom: 2rem;
}

nav a {
  margin-right: 1rem;
}

pre {
  overflow-x: auto;
  padding: 1rem;
  background: #f4f4f4;
}