.box { width: 1200px; margin: 0 auto; margin-top: 20px; }
.banner { width: 100%; height: 826px; background:url(//www.xinhuanet.com/video/cj/index/images/pc_mobile/banner.jpg) no-repeat 50% 0  }
.container {  margin-top:-472px; }

@media screen and (max-width: 768px) {

.box { width: 96%; margin: 0 auto; margin-top: 0; }

.banner1{ width:100%; height:auto;}
.banner1 img{ width:100%; height:auto; position:relative; z-index:1}
.container{ margin-top:-152px; position:relative; z-index:200}

}