section.la-back {
    background-image: url(slides/slide-bg-2.jpg); 
    background-position: center;
    background-size: cover;
}

@media (max-width: 1200px) {
    section.la-back {
        background-image: url(slides/slide-bg-2-1199.jpg) !important;
        background-position: center;
        background-size: cover;
    }
}

@media (max-width: 991px) {
    section.la-back {
        background-image: url(slides/slide-bg-2-991.jpg) !important;
        background-position: center;
        background-size: cover;
    }
}

@media (max-width: 767px) {
    section.la-back {
        background-image: url(slides/slide-bg-2-767.jpg) !important;
        background-position: center;
        background-size: cover;
    }
}

@media (max-width: 575px) {
    section.la-back {
        background-image: url(slides/slide-bg-2-575.jpg) !important;
        background-position: center;
        background-size: cover;
    }
}