.top_menu li.menu-item-has-children { position:relative}
.top_menu li.menu-item-has-children > button { display:none}

.top_menu li.menu-item-has-children ul {
    display:none;
    position:absolute;
    background:#132149;
    left:0;
    margin-top:11px;
}
.top_menu li.menu-item-has-children:hover > ul { display:block}

.top_menu li.menu-item-has-children > ul > li {
    display:block!important;
    float:none;
    
}
.top_menu li.menu-item-has-children > ul > li a { display:block}