.product-about{background:#000 url(../img/index/main_img.jpg) center center no-repeat}.product-img{bottom:40px;right:10px}.system-wrap{padding:40px 0 40px 60px;background-color:#f7f7f7}.system-wrap .system_sp{display:none}.about-logo{bottom:30px;left:-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}.system-wrap{padding:15px 10px}.system-wrap .topic-ttl{margin-bottom:20px;font-size:18px}.system-wrap .system_pc{display:none}.system-wrap .system_sp{display:inherit}.about-logo{bottom:10px;left:10px}}