代码示例：（标识：bs_form_input_group_size）
<!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.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/js/bootstrap.bundle.js"></script>
</head>
<body>
<div class="p-4">
<h2>输入组大小</h2>
<p>请将 .input-group-sm 类用于小型输入组，将 .input-group-lg 用于大型输入组：</p>
<div class="input-group input-group-sm mb-3">
<span class="input-group-text">小型</span>
<input type="text" class="form-control">
</div>
<div class="input-group mb-3">
<span class="input-group-text">默认</span>
<input type="text" class="form-control">
</div>
<div class="input-group input-group-lg mb-3">
<span class="input-group-text">大型</span>
<input type="text" class="form-control">
</div>
</div>
</body>
</html>
