.Imagen .parallax{
    height: 400px;
    background-attachment: fixed;
    background-position: bottom;
    background-repeat: no-repeat;
    background-size: cover;
}

@media (min-width: 992px){
    .Imagen .parallax{
        height: 450px;
    }

}

@media only screen and (min-width: 390px) and (-webkit-device-pixel-ratio: 3) {
    .Imagen .parallax {
        min-height: 400px;
        background-attachment: unset;
        background-position: center;
        background-repeat: no-repeat;
        background-size: cover;
    }
}