w3css-kn6b3dxd_1 在线代码实例

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<!DOCTYPE html>
<html>
<head>
    <title>W3.CSS(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
<body>
<div class="w3-container">
    <h1>使用 w3-margin</h1>
    <div class="w3-border">
        <div class="w3-container w3-margin w3-green">
            <p>w3-margin 类将 16px 的空白添加到元素的所有侧面。</p>
        </div>
    </div>
</div>
</body>
</html>
 
 
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运行结果
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