try_w3examples_102 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 class="w3-container">
<h2>显示警报</h2>
<p>w3-panel类可用于显示警报：</p>
<div class="w3-panel w3-pale-red w3-border">
    <h3>危险！</h3>
    <p>红色通常表示危险或负面情况。</p>
</div>
<div class="w3-panel w3-red">
    <h3>危险！</h3>
    <p>红色通常表示危险或负面情况。</p>
</div>
</body>
</html>
 
 
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运行结果
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