header[role="banner"] .banner-wrap h1 a span.logo-bg {
    background-image: url("img/ch-logo.png");
    max-width: 187px;
    height: 45px;
}


@media screen and (min-width:768px) {
    header[role="banner"] .banner-wrap h1 a span.logo-bg {
        background-image: url("img/ch-logo.png");
        max-width: 187px;
        height: 75px;
    }
}