.dropdown-menu {
        display: none !important;
    }

    .nav-item.dropdown:hover>.dropdown-menu {
        display: block !important;
    }

    .dropdown-submenu .dropdown-menu {
        display: none !important;
        position: absolute;
        left: 100%;
        top: 0;
    }

    .dropdown-submenu:hover>.dropdown-menu {
        display: block !important;
    }