body {
    font-size: 1rem;
    padding: 0 15px;
    max-width: 700px;
    margin: auto;
  }
  p {
    font-size: 1rem;
    line-height: 1.6;
    color: #555;
  }
  h1 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #222;
  }
  h2 {
    font-size: 1.4rem;
    margin-top: 40px;
    color: #333;
  }
  nav {
    margin-bottom: 20px;
  }