.first-page-bg{background:url(/img/content_bg.jpg?v=2);height:100%;background-size:cover;position:relative;border:1px solid #fff;border-radius:0;opacity:.9}.wel{display:-webkit-box;display:-ms-flexbox;display:flex;-ms-flex-wrap:wrap;flex-wrap:wrap;width:1100px;margin:0 auto}