@charset "utf-8";
  .cms_body {
        margin: 0;
        height: 633px;
        background: url(http://www.imtaweb.net/cms_fragments/res/93/images/p1.jpg) no-repeat center top;
    }
    .mainBox{
       height: 2493px; margin-top: 663px; background: url(http://www.imtaweb.net/cms_fragments/res/93/images/p2.jpg) no-repeat center top; position: relative;
    }
    .mainBox .btn{ display: block; position: absolute; background: #38afd5; color: #fff; line-height: 50px; width: 220px; left: 50%; margin:860px 0 0 -110px; text-align: center; font-size: 18px; border-radius: 5px; -webkit-border-radius: 5px; -moz-border-radius: 5px; font-family: "微软雅黑"; }
    .mainBox .btn:hover{ background: #54c1e4; text-decoration: none;}