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實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>编程狮(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
<body>
    <p>当鼠标悬停在一个元素上时，改变背景颜色</p>
    
    <div class="w3-container w3-hover-aqua">
      <h2>伦敦</h2>
      <p>伦敦是英国人口最多的城市，其都市区人口超过900万。</p>
    </div>
</body>
</html>
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