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运行代码 
<!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>
<h2>显示面板</h2>
<p>面板与容器相同，只是增加了顶部和底部边距。</p>
<div class="w3-panel w3-red">
    <p>我是面板。</p>
</div>
<div class="w3-panel w3-green">
    <p>我是面板。</p>
</div>
<div class="w3-container w3-red">
    <p>我是一个容器。</p>
</div>
<div class="w3-container w3-green">
    <p>我是一个容器。</p>
</div>
</body>
</html>
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运行结果
PC端 手机端 平板端