index.css

* {
    box-sizing: border-box;
    font-family: sans-serif;
  }
  #navbar {
    width: 300px;
    height: 150vh;
    border: 1px solid #000;
    display: block;
    justify-content: center;
    margin-top: 0px;
    padding-top: 0px;
    border-left: 0px;
    border-top: 0px;
    overflow-y: hidden;
    overflow-x: hidden;
    position: fixed;
  }
  /* This media action is for mobile-phones */
  @media (max-width: 1200px) {
    #navbar > ul {
      min-width: 320px;
      height: 27vh;
    }
    #main-doc {
      min-width: 370px;
    }
  }
  
  /*this media action is for laptops and desktops*/
  
  h1 {
    text-align: center;
    border-bottom: 1px solid #000;
    padding-bottom: 10px;
    margin-bottom: 0;
    font-size: 30px;
    font-weight: lighter;
    padding-top: 0px;
  }
  #navbar > ul {
    list-style: none;
    padding-left: 4px;
  }
  #navbar li {
    font-size: 19px;
    padding-bottom: 10px;
    padding-top: 10px;
    border-bottom: 1px solid #000;
  }
  .nav-link {
    color: #000;
    text-decoration: none;
    margin-left: 10px;
  }
  
  /*above are all about the nav and headers, below are all on the main part of the document*/
  
  #main-doc {
    width: 800px;
    display: block;
    margin-left: 300px;
    bottom: 700px;
    padding-left: 20px;
  }
  
  #main-doc header {
    padding-top: 20px;
    font-size: 25px;
    text-align: left;
    padding-left: 10px;
  }
  #main-doc article {
    padding-left: 35px;
  }
  #main-doc,
  li {
    padding-bottom: 10px;
  }
  code {
    background-color: #f7f7f7;
    display: flex;
    justify-content: center;
    padding-left: 30px;
    border: 1px solid #fff1;
    margin-left: 5px;
    font-family: Arial, Helvetica, sans-serif;
  }