@media (min-width: 700px) {
    .Imagen1 {
        content: url("../AMONCOVETBig.jpg");
    }

    .Imagen2 {
        content: url("../SANJERONIMObig.jpg");
    }

    .Imagen3 {
        content: url("../BoehRingerBig.jpg");
    }

    .Imagen4 {
        content: url("../AMMVEPEbig.jpg");
    }

    .Imagen5 {
        content: url("../MARSbig.jpg");
    }

    .Imagen6 {
        content: url("../WALTHAMBig.jpg");
    }
}

@media (max-width: 700px) {
    .Imagen1 {
        content: url("../AMONCOVETSmall.jpg");
    }

    .Imagen2 {
        content: url("../SANJERONIMOsmall.jpg");
    }

    .Imagen3 {
        content: url("../BoehRingerSmall.jpg");
    }

    .Imagen4 {
        content: url("../AMMVEPEsmall.jpg");
    }

    .Imagen5 {
        content: url("../MARSsmall.jpg");
    }

    .Imagen6 {
        content: url("../WALTHAMSmall.jpg");
    }
}