* {
    font-family: Tahoma;
    scroll-behavior: smooth;
  }
  
  #navbar {
    height: 100%;
    width: 200px;
    position: fixed;
    top: 0;
    left: 0;
    padding-top: 20px;
    background-color: #DDE6ED;
  }
  
  hr {
    background-color: black;
    height: 3px;
    border: none;
  }
  
  ul{
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
  }
  
  
  li a {
    color: #27374D;
    text-align: center;
    text-decoration: none;
    padding: 15px;
    font-size: 20px;
    display: block;
    transition: 0.2s;
  }
  
  li a:hover:not(.active) {
    background-color: #9DB2BF;
    color: #DDE6ED;
  }
  
  li header {
    font-size: 30px;
    text-align: center;
    padding: 10px;
  }
  
  .active {
    background-color: #04AA6D;
  }
  
  .main-section header {
    margin-top: 30px;
    font-size: 30px;
  }
  
  #main-doc {
    margin-left: 220px;
    font-size: 20px;
    transition: 0.3s;
  }
  
  .sidebar-toggle {
    display: none;
  }
  
  @media screen and (max-width: 768px) {
    #navbar {
      width: 0;
    }
  
    #main-doc {
      margin-left: 0;
    }
  
    .sidebar-toggle {
      display: block;
    }
  }
  
  #navbar.collapsed {
    width: 200px;
  }
  
  #main-doc.collapsed {
    margin-left: 220px;
  }
  
  #navbar {
    transition: width 0.3s ease;
  }
  
  button {
    background-color: #526D82;
    border: none;
    padding: 20px;
    top: 0;
    border-radius: 8px;
    color: #DDE6ED;
  }