@media screen and (max-width: 991px) {
  

    .sub_nav li.odd {
        display: none;
        width: 10px;
        height: 40px;
        color: #b73234;
        font: normal 16px/30px "微软雅黑";
    }

    .sub_nav li.even {
        float: left;
        height: 40px;
        text-align: center;
    }

   
}