.imagen_portada{
    background-image: url(../media/imagenes/galeria1.jpeg);
}
.lightbox .row{
    display: flex;
    width: 100%;
    margin: auto;
    align-items: center;
}
.lightbox a{
    padding: 1%;
}
.lightbox a img{
    box-shadow: 0px 0px 4px black;
}