.header-sky {
    position: absolute;
    z-index: 999;
    right: 0;
    left: 0;
    top: 0;
    background-color: rgb(0,0,0,0.8);
}
.header-sky .navbar.navbar-fixed-top {
    top: initial;
    z-index: 999;
    background-color: rgb(0,0,0,0.8);
}