.content-wrap{
    position: relative;
    background:url('/zt/jk/img/top-bg.png') center top no-repeat,
    url('/zt/jk/img/bottom-bg.png') center bottom no-repeat;
    background-size:1230px auto;
    }
.line-wrap{
    position: absolute;center;top:127px;bottom:75px;z-index:-1;
    width:100%;
    background:url('/zt/jk/img/middle-bg.png') center top repeat-y;
    background-size:1230px auto;
    }