@media (max-width: 1240px) {
    body div.center-all div.content section.isotope-layout div.item.w2 {
        width: 100%;
    }

    body div.center-all div.content section.isotope-layout div.item.w3 {
        width: 100%;
    }

    body div.center-all div.content section.isotope-layout div.item.w4 {
        width: 100%;
    }

    body div.center-all div.content section.isotope-layout div.item.w5 {
        width: 100%;
    }
}