@media only screen and (max-width: 1220px){
    .pj_content{
        width: 980px;
        height: auto;
        display: block;
        margin: 0 auto;
    }
    #des_cell{display: block;}
}
@media only screen and (max-width: 990px){
    .pj_content{
        width: 750px;
        height: auto;
        display: block;
        margin: 0 auto;
    }
    .pj_content_left{
        /*width: 300px;*/
        width: 100%;
        height: auto;
        padding: 10px 0;
        float: none;
    }
    .jiantou{
        position: absolute;
        top: 20px;
        right: 22px;
        display: block;
    }
    .products_info_pj{
        display: none;
    }
    .pj_content_right{
        /*width: 900px;*/
        width: 100%;
        height: auto;
        padding: 10px 0;
        float: none;
    }
    .des_cell>a:nth-child(2){
        width: 82.19%;
    }
    #des_cell{display: none;}
}
@media only screen and (max-width: 770px){
    .pj_content{
        width: 100%;
        height: auto;
        display: block;
        margin: 0 auto;
    }
    .des_cell>a:nth-child(2){
        width: 600px;
    }
    #des_cell{display: none;}
}
@media only screen and (max-width: 620px){
    .des_cell>a:nth-child(2){
        width: 100%;
    }
    #des_cell{display: none;}
}
@media only screen and (max-width: 520px){
    .pj_content_right{
        /*width: 900px;*/
        width: 100%;
        height: auto;
        padding: 10px 0;
        float: none;
    }
    .pj_img_nav>ul>li{
        width: 50%;
        height: auto;
        float: left;
        box-sizing: border-box;
        padding-left: 10px;
        margin-bottom: 10px;
        position: relative;
        font-size: inherit;


    }
    #des_cell{display: none;}
}