반응에 스타일을 도입하는 방법

<div className=&#39;topHead back fs14&#39;>
     <img src=&#39;/images/highLevel.png&#39; className=&#39;levelSize&#39;/>
</div>

import './index.css';

@import '~antd/dist/antd.css';
.topHead {
    width: 100%;
    height: 100px;
    display: flex;  
    align-items: center;
}
.back{
    background-image: url('/images/homeBackImg.png');
}
.levelSize{
    width: 80px;
    height: 80px; 
}
.levelColor{
    color:#ffffff;
}

 <Divider style={{margin:&#39;0px&#39;}}/>
也是用的style，但书写方式不一样了