@media screen and (max-width: 1920px){

    .big_code_img{
        width: 100%;
        height: 100%;
        display: none;
        position: fixed;
        top:0;
        left: 0;
        background-color: rgba(0,0,0,0.4);
        z-index: 9999;
    }
    .big_code_img .title{
        width: 100%;
        height: 20px;
        line-height: 20px;
        font-size: 16px;
        text-align: center;
        color: #fff;
        position: relative;
        margin-top:80px;

    }
    .big_code_img .show_code_img{
        width: 30%;
        height: auto;
        position: relative;
        margin: 10px 0 0 35%;
        display: block;
    }
    .big_code_img .close_big_img{
        display: block;
        width: 100px;
        height: 30px;
        line-height: 30px;
        background: red;
        color: #fff;
        font-size: 16px;
        padding:10px;
        position: relative;
        margin:10px auto;  
        border-radius: 4px; text-align: center;
        cursor: pointer;
    }

}@media screen and (max-width: 960px){

    .big_code_img{
        width: 100%;
        height: 100%;
        display: none;
        position: fixed;
        top:0;
        left: 0;
        z-index: 9999;
        background-color: rgba(0,0,0,0.4);
    }
    .big_code_img .title{
        width: 100%;
        height: 20px;
        line-height: 20px;
        font-size: 16px;
        text-align: center;
        color: #fff;
        position: relative;
        margin-top:80px;
    }
    .big_code_img .show_code_img{
        width: 80%;
        height: auto;
        position: relative;
        margin: 10px 0 0 10%;
        display: block;
    }
    .big_code_img .close_big_img{
        display: block;
        width: 40px;
        height: 20px;
        line-height: 20px;
        background: red;
        color: #fff;
        font-size: 16px;
        padding:10px;
        position: relative;
        margin:10px auto; 
        border-radius: 4px; 
        text-align: center;
        cursor: pointer;
    }
}