#menu ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #F3F3F3;
}

#menu li {
    float: left;
}

#menu li a, #menu .dropbtn {
    display: inline-block;
    color: blue;
    text-align: center;
    padding: 14px 12px;
    text-decoration: none;
}

#menu li a:hover, #menu .dropdown:hover .dropbtn {
    background-color: lightgrey;
}
#menu a#itemSelected {
    background-color: #dfdfdf;
}

#menu li.dropdown {
    display: inline-block;
}

#menu .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;
}

#menu .dropdown-content a {
    color: blue;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

#menu .dropdown-content a:hover {background-color: lightgrey}

#menu .dropdown:hover .dropdown-content {
    display: block;
}