body {
    background-image: url('https://soporte-sistemas.web.ve/InterPeru/imagenes/fondo2.jpg');
    font-family: Arial, sans-serif;
}
    .rutero {
    text-align: left;
}
.div-form {
    width: 530px;
}
@media (max-width: 753px) {

    .img-prin {
        content: url(https://soporte-sistemas.web.ve/Audi/Formularios_web/actualizacion/imagenes/banner_1_peq.tif);
    }

    .form-group{

    }
    .rutero{
        text-align:center;
    }
    .div-form {
        width: 450px;
    }
    body {
        background-image: url('https://soporte-sistemas.web.ve/InterPeru/imagenes/fondo-mobile.png');
    }
    }
}