@media screen and (max-width: 979px) {
    .navbar #access .menu-menu-principal-container,
    .navbar #access ul#menu-menu-principal,
    .navbar #access ul#menu-menu-principal li ul.sub-menu
    {
        background : #212325;
    }
}

.navbar #access ul#menu-menu-principal li ul.sub-menu  ul.sub-menu{
    top: 0px;
}