Vertikales menü mit Untermenü

#secondary .menu-item,
#secondary ul li {
    clear: both;
    display: block;
    float: none;
    position: relative;
    width: 100%;
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 1.2em;
    font-weight: bold;
    line-height: 3em;
}
#secondary .menu-item a,
#secondary ul li a {
    display. block;
    margin-left: 0;
    width: 100%;
}
#secondary .menu-item a:hover,
#secondary ul li a:hover {
    color: blue;
}
#secondary .sub-menu,
#secondary .children {
    position: relative;
    border: 1px solid red;
}
#secondary .sub-menu .menu-item,
#secondary .children li   {
    font-size: 1rem;
    border: 1px solid blue;
}
#secondary .sub-menu{
    display: none;
}
#secondary .menu-item a:active,
#secondary ul li a:active < #secondary .sub-menu{
    display: block;
}