body {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: row;
    font-family: 'Open sans';
    line-height: 1.5;
    color: #4d4e53;
    background-color: white;
  }
  
  #navbar {
    width: 25%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    position: fixed; /* Make the side menu fixed by default */
  }
  
  #navbar ul {
    list-style-type: none; /* Remove bullet points from the list */
    padding: 0; /* Remove default padding */
    margin: 0; /* Remove default margin */
  }
  
  header {
    color: black;
    font-size: 1.8em;
    /* text-align: center;
    margin: 1em 0; */
  }
  
  #main-doc {
    width: 75%;
    height: 100vh;
    max-width: 900px;
    margin: 0 auto;
  }
  
  .nav-link {
    text-decoration: none;
    line-height: 1.5;
    color: #4d4e53;
    background-color: white;
    transition: background-color 0.3s;
  }
  
  .nav-link:hover {
    background-color: #f0f0f0;
  }
  
  #ul-navbar li {
    border-top: 1px solid black;
    padding: 11px 0;
    margin: 0;
    width: 70%;
  }
  
  code {
    background-color: #f7f7f7;
    display: block;
    padding: 15px;
    width: 70%;
    text-align: left;
    margin: 1em 0;
  }
  
  @media (max-width: 600px) {
    body {
      flex-direction: column;
    }
    #navbar {
      width: 100%;
      position: static; /* Make the side menu not fixed on smaller devices */
    }
    #ul-navbar li{
        width: 100%;
    }
    #main-doc {
      width: 100%;
    }
  }