@media (prefers-reduced-motion: no-preference) {
    * {
      scroll-behavior: smooth;
    }
  }
  
  body {
    display: flex;
    font-family: Arial, sans-serif;
    line-height: 1.3rem;
    margin: 0;
    padding: 0;
  }
  
  nav {
    background-color: #333;
    color: white;
    width: 200px;
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
  }
  
  .navbar-header {
    font-size: 1.5em;
    font-weight: bold;
    color: whitesmoke;
    margin: 10px 0 10px 10px ;
  }
  
  .nav-link {
    display: block;
    text-decoration: none;
    text-transform: uppercase ;
    letter-spacing: 0.1rem;
    color: white;
    transition: background-color 0.3s;
    position: relative;
  }
  a {
    border-top: 1px solid white;
    padding: 10px
  }
  
  a:last-child {
    border-bottom: 1px solid white;
  }
  
  .nav-link:hover {
    background-color: #555;
  }
  
  main {
    margin-left: 250px; 
    padding: 20px 40px 0 20px;
  }
  
  .main-section {
    margin-bottom: 40px;
  }
  
  header {
    font-size: 2em;
    margin-bottom: 20px;
  }
  
  p {
    line-height: 1.8rem;
    margin-bottom: 20px;
  }
  
  span {
    font-weight: bold;
    font-size: 1.1rem;
    text-decoration: underline;
  }
  
  .code-caveat {
    font-weight: normal;
    font-size: 0.75rem;
    text-decoration: none;
    font-style: italic;
  }
  
  code {
    display: block;
    background-color: #f7f7f7;
    border-radius: 4px;
    margin: 20px;
    padding: 15px;
  }
  
  li {
    margin: 10px 0 5px 20px;
    list-style:circle
  }