.bg-banner {
    background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url(https://upc-cdn.b-cdn.net/web-postgrado/landings/cursos-de-especializacion/derecho/derecho-corporativo/assets/images/bg-mobile.webp);
}
@media (min-width: 768px) {
    .bg-banner {
        background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url(https://upc-cdn.b-cdn.net/web-postgrado/landings/cursos-de-especializacion/derecho/derecho-corporativo/assets/images/bg-desktop.webp);
    }
}