.nav > li:nth-of-type(1) a {
      color: #2a4f82;
      text-decoration: underline;
    }
    .img{
      width:100%;
      position: relative;
      overflow: hidden;
    }
    .img > img{
      display: block;
    }
    #content{
      width: 100%;
      height: 680px;
      background: #fff;
      overflow: hidden;
    }
    #content::after{
      clear: both;
      display: block;
      content: '';
    }
    .con1{
      width: 300px;
      height: 1280px;
      float: left;
      text-align: left;
      background: #fff;
    }
    .con1 > h2{
      margin-left: 70px;
      margin-top: 50px;
      color:#2e5284;
    }
    .con1 > ul{
    margin-left: 70px;
    margin-top: 50px;
    }
    .con1 > ul > li{
      line-height: 60px;
    }
    .con1 > ul > li > a{
      font-size: 20px;
      font-weight: bold;
    }
    .con1 > ul > li > a.on{
      color:#2e5284;
      font-weight: bold;
      padding-bottom: 3px;
      border-bottom: 2px solid #2e5284;
    }
    .con1 > ul > li > a:hover{
      color:#2e5284;
      font-weight: bold;
    }
    .con2{
      float: left;
      width: 1100px;
      height: 1280px;
    }
    .con2 > div{
      width: 100%;
      height: 100%;
      overflow: hidden;
    }
    .con2 img{
      margin-top: 50px;
    }