菜鸟教程在线编辑器

左右布局
AI 编程工具
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<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.staticfile.net/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js"></script>
</head>
<body>
​
<div class="container mt-3">
    <h3>设置下拉菜单</h3>
​
    <form>
        <label for="demo">这里输入您的邮箱:</label>
        <div class="input-group mb-3">
            <input type="text" class="form-control" placeholder="Email" id="demo" name="email">
            <span class="input-group-text">@runoob.com</span>
        </div>
    </form>
</div>
​
</body>
</html>