#pantalla-inicio{
    background: linear-gradient( rgba(0, 0, 0, .9), rgba(0, 0, 0, .1)), url("/img/sector-residencial.png");
    background-size: cover;
    background-position: center center;
    height: 70vh;
}


@media screen and (max-width: 400px) {
    #pantalla-inicio{

        height: 100vh;
    }
}