.case-study-unit-page.skully-page header {
    background: url(/assets/img/skully/desk/bg.png) no-repeat center;
    background-size: cover;
}

@media only screen and (max-width: 600px) {
    .case-study-unit-page.skully-page header {
        background: url(/assets/img/skully/mob/bg.png) no-repeat center,
            rgba(27, 37, 46, 1);
        background-size: cover;
    }
}