/* header */

.gf-headerVisual .media-box {
    margin: 0;
    padding: 0;
}
.gf-headerVisual .media-box img {
    display: block;
    margin: 0;
    padding: 0;
    width: 100%;
    height: auto;
}

@media screen and (max-width:767px) {
    .gf-headerVisual .media-box {
        padding-top: 100%;
        background-image: url('guitar_finder_visual_sp.jpg');
        background-position: center center;
        background-repeat: no-repeat;
        background-size: cover;
    }
    .gf-headerVisual .media-box img {
        display: none;
    }
}