.DaoHangLan{margin: 0;}
.top_span{                                  /*整体CSS框架*/
    text-align: center;
    margin: 30px;
    font-size: 30px;
    float: right;
    margin-top: 0px;
    margin-bottom: 0px;
    padding-top: 0.3%;
}
.top_ul{
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    border: 1px solid #e7e7e7;
    background-color:#3b4348;
}
.top_li{
    float: right;
}
.top_li .top_a {
    display: block;
    color: #666;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}
li a:hover:not(.active) {
    background-color: #ddd;
}