subsite-menu.css

/* More compact dropdown + visible if collapsed */

.cms .cms-menu .cms-subsites {
    padding: 0;
}

.cms .cms-menu .cms-subsites .field.dropdown {
    margin: 0;
}

.cms-subsites .field .chosen-container-single .chosen-single {
    border-radius: 0;
}

.cms .cms-menu .cms-subsites select {
    visibility: hidden;
    height: 34px;
    border-radius: 0;
}

.cms .cms-menu.collapsed .cms-subsites {
    display: block;
}

.cms-menu.collapsed .cms-subsites .chosen-drop {
    min-width: 180px;
}

.cms-subsites .field .chosen-drop .active-result:hover {
    opacity: 0.9;
}

.cms-subsites .field .chosen-drop .result-selected {
    color: #999;
    background: #ccc;
}