.fc{
    clear: both;
}



@media screen and (min-width: 680px){
    .imgnb img:nth-child(2){
        margin-left: 55px;
    }
    .imgnb{
        text-align: center;
        margin-bottom: 30px;
    }
    .head_xc{
        width: 1200px;
        margin: 0 auto;
        margin-top: 10px;
    }
    .bwcx_bg{height: 0px;position: relative;z-index: -1;}
    .bwcx_bt{width:100%;margin: 0px auto;position: relative;}
    .logo{width: 140px;/*margin-bottom: 50px;*/}
    .logo a img{width: 225px;}
    body{
        background: url(../images/nbbb-bg.png);
        background-size: 100%;
        background-repeat:no-repeat;
    }
    .content_nb{
        width: 1200px;
       /* background: url(../images/conbgss.png);*/
        margin: 0 auto;
        /*margin-top: 300px;*/
        background-color: white;
        position: relative;
        background-repeat:no-repeat;
    }
    .head_img{
        text-align:center;
    }
    .head_img img{
        width: 850px;
        height: auto;
        margin-bottom: 50px;
        margin-top: 50px;
    }

    .guidang{
        position: absolute;
        right: 0;
        top: 12px;
     }
    .guidang img {
        width:120px;
    }

    .nb_item:nth-child(1){
        position: absolute;
        top: -20px;
    }
    .nb_item{
        width: 100%;
        height: 89px;
        background: url(../images/titebg.png);
        font-size: 24px;
        line-height: 89px;
        text-align: center;
        color: white;
    }
    .heights{
        height: 100px;
    }
    .heights1{
        height: 30px;
    }
    .dwname{
        padding: 0;
        margin: 0;
        margin-bottom: 20px;
    }
    .dwname li{
        list-style: none;
        float: left;
        width: 23%;
        height: 80px;
        border: 1px solid #ccc;
        position: relative;
        margin-left: 1.5%;
        border-radius: 15px;
        font-size: 16px;
        margin-bottom: 10px;
    }
    .dwname li a{
        display: block;
        width: 90%;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        text-align: center;
        text-decoration: none;
        color: black;
    }
}
@media screen and (max-width: 670px){
    .imgnb img{
        display: block;
        width: 95%;
        margin: 0 auto;
        margin-top: 10px;
    }
    .head_xc{
        width: 100%;
        margin: 0 auto;
    }
    .guidang{
        position: absolute;
        right: 0;
        top: 60px;
        z-index:99;
     }
    .guidang img {
        width:80px;
    }
    .bwcx_bg{height: 0px;position: relative;z-index: -1;}
    .bwcx_bt{width:100%;margin: 0px auto;}
    .logo{width: 140px;/*margin-bottom: 50px;*/}
    .logo a img{width: 71%;}
    body{
        background: url(../images/nbbb-bg.png)!important;
        background-size: 100% 30%!important;
    }
    .content_nb{
        width: 100%;
        /* background: url(../images/conbg.png); */
        margin: 0 auto;
        /* margin-top: 82px;*/
        background-color: white;
        position: relative;
        padding-bottom: 20px;
        background-repeat: no-repeat;
    }
    .head_img{
        text-align:center;
    }
    .head_img img{
        display:block;
        height: 70px;
        margin-bottom: 20px;
        margin-top:5px;
        width: 100%;
    }
    .nb_item:nth-child(1){
        position: absolute;
        top: -7px;
    }
    .nb_item{
        width: 100%;
        height: 50px;
        background: url(../images/titebg.png) no-repeat;
        background-size: 100% 78%!important;
        font-size: 11px;
        line-height: 35px;
        text-align: center;
        color: white;
    }
    .heights{
        height: 50px;
    }
    .heights1{
        height: 20px;
    }
    .dwname{
        padding: 0;
        margin: 0;
        margin-bottom: 20px;
    }
    .dwname li{
        list-style: none;
        float: left;
        width: 48%;
        height: 60px;
        border: 1px solid #ccc;
        position: relative;
        margin-left: 1.5%;
        border-radius: 15px;
        margin-bottom: 10px;
    }
    .dwname li a{
        display: block;
        width: 90%;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        text-align: center;
        text-decoration: none;
        color: black;
    }

}