App下載
實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!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">
    <h2>警报面板</h2>
    <p>在W3面板类非常适合显示警报：</p>
    <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>
</div>
</body>
</html>
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