.topnav {
    max-width: 750px;
  
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
    background-color: none;
  }
  
  .topnav a {
    width: auto;
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    padding: 22px 32px;
    text-decoration: none;
    font-size: 17px;
    transition: background-color 0.5s ease;
  }
  
  .topnav a:hover {
    background-color: #ddd;
    color: black;
    border-radius: 0px 0px 0px 0px;
  }
  
  .topnav a.active {
    background-color: none;
    color: #ffffff;
    transition: background-color 0.5s ease;
  }
  
  .topnav a.active:hover {
    background-color: none;
    color: green;
    transition: background-color 0.5s ease;
  }
  
  .topnav .icon {
    display: none;
  }
  
  @media screen and (max-width: 768px) {
    .topnav a:not(:first-child) {display: none;}
    .topnav a.icon {
      float: right;
      display: block;
    }
  }
  
  @media screen and (max-width: 768px) {
    .topnav.responsive {position: relative;}
    .topnav.responsive .icon {
      position: absolute;
      right: 0;
      top: 0;
      
    }
    .topnav.responsive a {
      float: none;
      display: block;
      text-align: center;
      background-color: #007236;
      transition: background-color 0.5s ease;
    }
    .topnav.responsive a:hover {
      float: none;
      display: block;
      text-align: center;
      background-color: #007236;
      color: #ffcb05;
      transition: background-color 0.5s ease;
      
    }
  }