#headernav{
    position: fixed;
    background-color: transparent;
    z-index: top;
}

#headernav.package{
    background-color: rgba(0, 0, 0, .7);
}
@media (max-width:991px) {
    #headernav{
        position: fixed;
        background-color: rgba(0, 0, 0, 1);
    }
    #headernav.package{
        background-color: rgba(0, 0, 0, 1);
    }
}