W3School TIY 亲自试一试！

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h3>输入组按钮</h3>
  
  <div class="input-group mb-3 mt-3">
    <button class="btn btn-outline-primary" type="button">基础按钮</button>
    <input type="text" class="form-control" placeholder="一些文本">
  </div>

<div class="input-group mb-3">
    <input type="text" class="form-control" placeholder="一些文本">
    <button class="btn btn-primary" type="button">OK</button> 
    <button class="btn btn-danger" type="button">Cancel</button> 
  </div>
</div>

</body>
</html>

W3School TIY Editor