.promo-section {
    padding: 10px 15px 70px;
}
img.promo-ads-mob.aligncenter {
    display: none;
}

@media only screen and (max-width:1023px) {
    img.promo-ads-mob.aligncenter {
        display: block;
    }
    img.promo-ads.aligncenter {
        display: none;
    }
}