App下載
實例代碼( Tip: 登錄后體驗更佳 )
<!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>透明度</h2>
    <p>w3-opacity 类为元素添加透明度（不透明度为60％）。</p>
    <p class="w3-opacity">伦敦是英格兰的首都。</p>
</div>
<div class="w3-container w3-red">
    <p class="w3-opacity">伦敦是英格兰的首都。</p>
</div>
</body>
</html>
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運行結果