@media only screen and (max-width : 979px) {

}

@media only screen and (max-width : 767px) {

}

@media only screen and (max-width : 576px) {
    #header-top-bar {
        display: none;
    }
}

@media only screen and (max-width : 360px) {

}

@media only screen and (max-width : 320px) {

}