section.bg-oficina {min-height: 50vh;
    background: url(/public/img/oficinas/gracias-ib.jpg) no-repeat center left;
    background-size: contain;
    background-position: 100% 20%;}

@media (max-width:1200px) {
    section.bg-oficina {background-size: cover;}
section.bg-oficina:before {
    width:100%; height:100%; position:absolute; background:rgba(255,255,255,.8);
    }