Bootstrap类input-group-xs
要制作更小的输入组，请使用input-group-xs。
您可以尝试运行以下代码以在Bootstrap中实现input-group-xs类：
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link href = "/bootstrap/css/bootstrap.min.css" rel = "stylesheet">
<script src = "/scripts/jquery.min.js"></script>
<script src = "/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div style = "padding: 100px 100px 10px; background: blue;">
<form class = "bs-example bs-example-form" role = "form">
<div class = "input-group input-group-xs">
<span class = "input-group-addon">$</span>
<input type = "text" class = "form-control">
</div>
</form>
</div>
</body>
</html>