.img_wrapper{
    width: 100%;
    height: 16.1458vw;
    background: url(/wp-content/uploads/wcif/images/introduce.png) no-repeat center center/33.3333% auto;
}
.content_text{
    margin-top: 2.6042vw;
    font-size: .9375vw;
    line-height: 1.7708vw;
}

@media all and (max-width:991px){
    .img_wrapper{
        height: 32.5521vw;
        background-size: 58.1395% auto
    }
    .content_text{
        margin-top: 5.2083vw;
        font-size: 2.3438vw;
        line-height: 4.4271vw;
    }
}

@media all and (max-width:479px){
    .img_wrapper{
        height: 31.9444vw;
        background-size: 62.5% auto;
    }
    .content_text{
        margin-top: 5.5556vw;
        font-size: 3.8889vw;
        line-height: normal;
    }
}