#con_intro{max-width:1280px;margin:0 auto 50px}@media only screen and (min-width: 768px){#con_intro{margin:0 auto 100px;overflow:hidden}}.con_box{max-width:1280px;margin:0 auto 50px}.con_box .img{margin-bottom:30px;text-align:center}.con_box .detail h1.st_l{margin-bottom:15px}.con_box.last{margin-bottom:0}@media only screen and (min-width: 768px){.con_box{margin:0 auto 100px;overflow:hidden}.con_box .img{margin-bottom:0;float:left;width:24%}.con_box .detail{width:76%;float:right;padding-left:50px}.con_box .detail h1.st_l{margin-bottom:20px}}