#pantalla-inicio{
    background: linear-gradient( rgba(0, 0, 0, .9), rgba(0, 0, 0, .1)), url("/img/revit-structure.jpg");
    background-size: cover;
    background-position: center center;
    height: 50vh;
}
@media only screen and  (max-width: 768px) {
    #pantalla-inicio{
        height: 70vh;
    }
}
@media only screen and  (max-width: 400px) {
    #pantalla-inicio{
        height: 80vh;
    }
}