.charDom {
    position: relative;
    //屏幕大于750 或者小于1440
    @media screen and (max-width: 1920px) and (min-width: 750px){
        height: 100px;
        width: 100%;
    }
    @media screen and (max-width: 750px) and (min-width: 200px){
        height: 300px;
        width: 100%;
    }
}