css-伪元素清除浮动 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        li {
            list-style: none;
        }

        .box {
            box-sizing: border-box;
            width: 800px;
            background-color: gray;
            margin: 0 auto;
            padding: 0 97px;
        }

        ul li {
            float: left;
            width: 200px;
            height: 200px;
            background-color: pink;
            margin-right: 3px;
            margin-bottom: 3px;
        }

        ul li:nth-child(3n) {
            margin-right: 0;
        }

        ul::before,
        ul::after {
            content: '';
            display: table;
            clear: both;
            visibility: hidden;
        }
    </style>
</head>

<body>
    <div class="box">
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
</body>

</html>
posted @ 2025-09-24 09:09  紫川先生  阅读(13)  评论(0)    收藏  举报