@media screen and (max-width:640px) {
    body{
        overflow-x: hidden;
    }

    .header .login .user{
        text-align: right;
    }

    .header .login .user>a{
        padding-right: 20px;
    }

    .center_box,
    .center_box .center{
        width: 100%;
        border: none;
    }
    .center_box .center .center_left{
        width: 100%;
        float: none;
    }
    .center_box .center .center_left h3{
        display: none;
    }
    .center_box .center .center_left .center_nav{
        padding: 0px;
        text-align: center;
    }
    .center_box .center .center_left .center_nav ul{
        padding: 0px;
    }
    .center_box .center .center_left .center_nav ul li{
        display: none;
    }
    .center_box .center .center_left .center_nav ul li.on{
        display: block;
        width: 100%;
        background:#eee;
        height: 40px;
        line-height: 40px;
    }
    .center_box .center .center_left .center_nav ul li a{
        font-size: 16px;
        font-weight: lighter;
    }

    .center_box .center .center_right{
        width: 100%;
        float: none;
        padding: 10px 0px;
        border: none;
    }

    .center_box .center .center_right p{
        word-break: break-all;
        word-wrap: break-word;
        width: 95%;
        margin: 0px auto;
    }

    .center_box .center .center_right p img{
        width:100%;
        border:1px solid #eee;
        display: block;
    }

    .MsoNormal{
        width: 100% !important;
        margin-left: 0px !important;
        padding: 10px;
        box-sizing: border-box;
        text-indent: 0px !important;
        font-size: 0px !important;
    }
    .MsoNormal img{
        width: 95% !important;
        margin: 0 auto;
    }
}