h1.why_us{background-image:url(../../images/header_why_us.png)}.box h2,.box2 h2{display:block;height:22px;margin-top:-11px}h2 .box_num{margin:-9px 0 0 -22px;position:absolute}.box{background:url(../../images/why_us_bg.png) 0 0 no-repeat;float:left;height:174px;margin-left:20px;overflow:hidden;padding:12px;width:282px}.box2{background:url(../../images/why_us_bg_2.png) 0 0 no-repeat;float:left;height:140px;margin-left:20px;overflow:hidden;padding:12px;width:282px}.box_first{margin-left:0}