@media (max-width: 501px) {
    .col-img {
        height: 406px;
        padding: 60px;
        overflow: hidden;
    }
    .img-back {
        background-size: contain;
        background-position: center;
    }
}

@media (max-width: 1230px) {
    .contacto-section {
        -webkit-background-size: cover;
        -moz-background-size: cover;
        -ms-background-size: cover;
        -o-background-size: cover;
        background-size: cover;
        background-attachment: fixed;
        background-repeat: no-repeat;
        background-position: top;
    }
}