nav
{
    list-style-type: none;
}

nav li {
    float: left;
}

body {
    background: url("http://tiemcomeernik.nl/IMG/achtergrond.jpg") no-repeat center center fixed;
    background-size: cover;
}


.dropknop {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
  }
  
  .dropmenu {
    position: relative;
    display: inline-block;
  }
  
  .dropcontent {
    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;
  }
  
  .dropcontent a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
  }
  
  .dropcontent a:hover {background-color: #f1f1f1}
  
  .dropmenu:hover .dropcontent {
    display: block;
  }
  
  .dropmenu:hover .dropknop {
    background-color: #3e8e41;
  }