#navbarNavDropdown ul li > .dropdown-menu {
    top: 55px;
    font-size: .8rem;
    background-color: #fff;
    border: 1px solid #f1f1f1;
    border-radius: 0;
    border-top: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,.04);
}

#navbarNavDropdown ul li ul li > .dropdown-item {

    position: relative;

}

#navbarNavDropdown ul li ul li > .dropdown-toggle::after {
    position: absolute;
    right: .9rem;
    top: 48%;
}