ul {
      list-style-type: none;
      margin: 0;
      padding: 0;
      overflow: hidden;
      background-image: url('files/7.jpg');
    }
    
    li {
      float: left;
    }
    
    li a, .dropbtn {
      display: inline-block;
      color: white;
      text-align: center;
      padding: 14px 16px;
      text-decoration: none;
    }
    
    li a:hover, .dropdown:hover .dropbtn {
      background-color: rgb(43, 172, 212);
    }
    
    li.dropdown {
      display: inline-block;
    }
    
    .dropdown-content {
      display: none;
      position: absolute;
      background-color: #f9f9f9;
      min-width: 160px;
      box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
      z-index: 1;
    }
    
    .dropdown-content a {
      color: black;
      padding: 12px 16px;
      text-decoration: none;
      display: block;
      text-align: left;
    }
    
    .dropdown-content a:hover {background-color: rgb(174, 213, 227);}
    
    .dropdown:hover .dropdown-content {
      display: block;
    }