nav .drop-down-menu {
    list-style: none;
    overflow: hidden;
    height: 19px;
    background-color: #ffffff;
    font-family: Arial;
    width: 150px;
    margin: 0 auto;
    padding: 0;
    text-align: center;
    border-bottom: 2px solid #aff;
    -webkit-transition: height 0.3s ease;
    transition: height 0.3s ease;
}

nav .drop-down-menu-single {
    list-style: none;
    overflow: hidden;
    height: 19px;
    background-color: #ffffff;
    font-family: Arial;
    width: 150px;
    margin: 0 auto;
    padding: 0;
    text-align: center;
    -webkit-transition: height 0.3s ease;
    transition: height 0.3s ease;
}

nav .drop-down-menu-single li a {
    white-space: nowrap;
    display: block;
    color: darkblue;
    font-size: 14px;
    text-decoration: none;
}

nav .drop-down-menu-single li {
    border-bottom: 2px solid #aff;
}

nav .drop-down-menu-single li a.highlighted {
    background-color: #2755A3;
    color: #ffffff;
}

nav .drop-down-menu.closed {
    height: 19px;
}

nav .drop-down-menu li {
    border-bottom: 3px solid #fff;
}

nav .drop-down-menu li a {
    white-space: nowrap;
    display: block;
    color: darkblue;
    font-size: 14px;
    text-decoration: none;
}

nav .drop-down-menu li:first-child a:after {
    content: "\25BC";
    float: right;
    margin-left: -30px;
    margin-right: 5px;
    white-space: nowrap;
}

nav .drop-down-menu li a.highlighted {
    background-color: #2755A3;
    color: #ffffff;
}