.mian-banner{position:relative;height:400px}.mian-banner img{display:block;width:100%;height:100%}.mian-banner .banner-caption{top:92px;left:0;right:0;width:500px;margin:0 auto;content:"";position:absolute;text-align:center}.mian-banner .banner-caption a{font-size:42px;color:#fff;font-weight:300}