header {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

ul.horizontal {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #E3E1DC;
    display: flex;
    flex-wrap: nowrap;
}

ul.horizontal li {
    margin-right: 10px;
}

a {
    color: #000;
    text-decoration: none;
}

a:visited,
a:hover,
a:active,
a:focus {
    color: #666;
    text-decoration: none;
}

.currentlyActive {
  background: #BFE3C4;
  
}