.product-about{background:#000 url(../img/index/main_img.jpg) center center no-repeat}.product-img{bottom:40px;right:10px}@media only screen and (max-width:640px){.product-about{background:#000 url(../img/index/main_img_sp.jpg) center bottom no-repeat;background-size:cover}.logo_p2hd{max-width:150px}}