.portada-fon{
    background-image: url("../img/fondo-carrucel.jpg");
    background-repeat:no-repeat ;
    background-position: center;
    background-size: 100%;
}
@media screen and (max-width:360px) {
    .portada-fon{
        background-image: url("../img/fondo-carrucel.jpg");
        background-repeat:no-repeat ;
        background-position: center;
        background-size: 220%;
    }  
}
@media (min-width:370px) and (max-width:499px) {
    .portada-fon{
        background-image: url("../img/fondo-carrucel.jpg");
        background-repeat:no-repeat ;
        background-position: center;
        background-size: 170%;
    }  
}

@media (min-width:500px) and (max-width:800px) {
    .portada-fon{
        background-image: url("../img/fondo-carrucel.jpg");
        background-repeat:no-repeat ;
        background-position: center;
        background-size: 120%;
    }
}