CSS伪元素before和after 

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>我是中国人</title>
        
        <style>
            /* CSS伪元素 */
            .wrap::before, .wrap::after {
                content: "我也是div";
                color: red;
                display: block;
            }
        </style>
    </head>
    <body>
        <div id="">
            <hr >
        </div>
        <div id="" class="wrap">
            这是div2
        </div>
        <div id="">
            <hr >
        </div>
    </body>
</html>

image

posted @ 2020-10-09 17:11  thomas_blog  阅读(167)  评论(0)  编辑  收藏  举报