.sec-ttl::before{background-image:url(../img/main_img.jpg);background-position:center;background-repeat:no-repeat;background-size:cover}.com-rice-cnt+.article-cnt{margin-top:10px;margin-bottom:140px}.article-box+.article-box{margin-top:40px}@media only screen and (max-width:640px){.sec-ttl::before{background-image:url(../img/main_img_sp.jpg)}.com-rice-cnt+.article-cnt{margin-top:0;margin-bottom:93px}}