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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>
<div class="w3-sidebar w3-bar-block w3-light-grey" style="width:25%">
    <a href="#" class="w3-bar-item w3-button">链接 1</a>
    <a href="#" class="w3-bar-item w3-button w3-hover-black">链接 2</a>
    <a href="#" class="w3-bar-item w3-button w3-hover-green">链接 3</a>
    <a href="#" class="w3-bar-item w3-button w3-hover-blue">链接 4</a>
    <a href="#" class="w3-bar-item w3-button w3-hover-red">链接 5</a>
</div>
<div style="margin-left:25%">
    <div class="w3-container w3-dark-grey">
        <h1>我的页面</h1>
    </div>
    <div class="w3-container">
        <p>当您将鼠标悬停在侧面导航内的链接上时，默认情况下背景颜色将变为灰色。</p>
        <p>如果要在悬停时使用不同的背景色，请使用任何w3-hover-color类。</p>
    </div>
</div>
</body>
</html>
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运行结果
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