@media screen and (max-width: 767px) {
    .banner_text p:nth-child(1){
        font-size: 24px;
    }
    .miancw{
        width: 100%;
        padding: 0 20px;
    }
    .top_nav td{
        font-size: 18px;
        padding-top: 30px;
        border-bottom: 1px solid #e9e9e9;
    }
    .intro td.nav{
        width: auto;
    }
}