.imagen-banner{
    /*height: calc(100vh - 72px);*/
    width: 100%;
}

@media screen and (min-width: 0) {
    .imagen-banner{
        height: calc(100vh - 51px); 
    }
}

@media screen and (min-width: 768px) {
    .imagen-banner{
        height: calc(100vh - 72px); 
    }
}