#pg-home #sect-img {
    min-height: 721px;
    background-image: url('http://rsc.alexmcmurray.com/img/core/AlexFernKKb_960x720.jpg');
}


@media screen and (max-width: 480px) {
    #pg-home #sect-img {
        min-height: 300px;
        background-image: url('http://rsc.alexmcmurray.com/img/core/AlexFernKKb_400x300.jpg');
    }
}