body {
    font-family: system-ui, sans-serif;
    margin: 2rem auto;
    line-height: 1.5;
    max-width: 600px;
  }
  nav a {
    margin-right: 1rem;
  }
  ul {
    list-style: none;
    padding: 0;
  }
  li {
    margin-bottom: 1.5rem;
  }