.nav-item>ul {
    display: none;
    position: relative;
    float: left;
}

.nav-item:hover>ul {
    position: absolute;
    display: block;
    background: white;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding: 10px;
    margin: 0 1rem;
}

.nav-item:hover>ul:hover ul {
    position: absolute;
    left: 160px;
    width: 170px;
    top: 50%;
    background: white;
    padding-left: 10px;
}

@media (max-width:991px) {
    .nav-item:hover>ul {
        display: inline-block;
        position: relative;
        width: 200px;
        left: 0;
    }
    .nav-item:hover>ul:hover ul {
        position: relative;
        left: 0px;
        width: 100%;
    }
    .nav-item:hover>ul:hover ul:hover ul {
        position: relative;
        left: 0px;
        width: 100%;
    }
    .fa-angle-right {
        display: none;
    }
}