@media (max-width: 750px) {
    .y_container{width: 100%;padding-left: 0}
    .z-banner img{
        height: 60px;
    }
    .ch_logo img {width: 118px;height: 38px;}
    .ch_top{padding: 9px 0 7px;}
    .ch_nav{position: absolute;background: #DBDBDB;border-radius: 5px;top: 10px;left: -75px !important;width: 106px;z-index: 999}
    .ch_nav_ul {display: block;align-items: center;z-index: 99999;position: relative}
    .ch_nav_ul li a{font-size: 14px;color: #000000;}
    .container-fluid{padding-left: 0;}
    .header-item{height: auto;}
    .ch_nav_ul li{margin-right: 0;}
    .ch_hosting h2,.ch_chain h2,.ch_brand_top h2,.ch_unit h2,.ch-title h3{font-size: 18px;font-weight: bold;margin: 1.14rem 0 1rem;}
    .ch-title p{font-size: 13px;}
    .ch_chain{margin-top: 0;padding-top: 26px;}
    .ch_chain_box_kj{width:90%;height: auto;margin:0 auto 15px;}
    .ch_brand_top{margin: 60px auto 30px;text-align: center;}
    .ch_apply {top: 30px;width: 96%;left: 50%;margin-left:-48%;padding:10px ;}
    .form-group input,.form_btn a{width: 100%;height: 40px;}
    .form-group textarea{width: 100%;}
    .ch_brand{margin-bottom: 60px;}
    .y_footer .y_footer_box{margin-bottom: 20px;}
    .y_footer .y_footer_box:first-child{width: 100%;margin:0 0 16px 4%; }
    .y_footer .y_footer_box:nth-child(2){width: 50%;margin-left: 4%}
    .y_footer .y_footer_box:nth-child(3){
        display: none;
    }
    .k_media .media .pull-right{
        margin-right: 0;
    }
    .y_footer .y_footer_box:nth-child(4){width: 100%;}
    .y_footer .y_footer_box h3{margin-bottom: 10px;}
    .y_footer .y_footer_bottom_di span{display: block;}
    .y_footer_box h5 span{word-break: break-all;}
    .ch_unit_box{width: 100%;margin:0 a0 12px;}
    .ch-title{margin: 40px 0;}
    .ch-thumbnail{margin-bottom: 20px;}
    .ch-core{padding:20px 20px 0;}
    .ch_col,.ch-core-text span{margin-bottom: 20px;}
    .ch-core-text{flex-wrap: wrap;}
    .ch-container-fluid{padding-bottom: 60px;}
    .hidden-480{display: none;}
    .z-con-news-icon,.z-con-news-icon img{width: 136px;height: 90px;}
    .z-con-news{height: 90px;}
    .z-con-news-right{width: 55%;margin-left: 10px;height: 90px;}
    .chain-box h1{width: 96%;margin:0 auto 15px;font-size: 18px}
    .z-con-news-right h5 a{padding: 0;font-size: 16px;}
    .z-con-news-right h6 {font-size: 12px;font-weight: 400;line-height: 17px;height: 34px;bottom: 0;}
    .chain .technorati{margin: 35px auto 30px;}
    .short_con_content_title h1 {font-size: 22px;}
    .con_author_left{margin-bottom: 6px;}
    .con_author_right{float: none;}
    .short_intro p{padding: 0 6px;}
    .short_intro p span:first-child{font-size: 18px;}
    .short_intro p span{font-size: 13px;}
    .short_intro{padding: 8px 6px;}
    .con_author_left p{font-size: 15px;}
    .login_bounced{display: flex;align-items: center;justify-content: center;display: none}
    .login_bounced_box{width:96%;margin: 0;top: 0;left: 0;}
/*    课堂*/
    .k_center,.k_media .pull-right img.media-object,.media-course ul li{
        width: 100%;
        margin-bottom: 10px;
    }
    .k_media .media,.media-course ul{
        display: block;
    }
    .k_media{
        padding: 0 6px;
    }
    .media-course{
        margin: 12px 0;
    }
    .media-buy{
        margin:0 auto;
        width: 160px;
        height: 36px;
    }
    .media-buy a{
        line-height: 36px;
    }
    .y_footer_bottom_di{
        padding-left: 10px;
    }
}