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实例代码( Tip: 登录后体验更佳 )
<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
<link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3-colors-metro.css">
<body>
<div class="w3-container">
<h1> w3-colors-metro</h1>
<div class="w3-panel w3-metro-yellow">
<h2></h2>
<p>900</p>
</div>
</div>
</body>
</html>
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运行结果