The following code shows how to mark control group.
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css"
href="http://getbootstrap.com/2.3.2/assets/css/bootstrap.css">
</head><!-- ww w. j av a 2 s. c o m-->
<body style='margin:30px'>
<form class="form-horizontal">
<div class="control-group">
<label class="control-label" for="inputName">Name</label>
<div class="controls">
<input type="text" placeholder="Name">
</div>
</div>
<div class="form-inline">
<div class="control-label">
<label for="inputCC">CC</label>
<label for="inputExpiryDate">Expiry Date</label>
</div>
<div class="controls">
<input type="text" placeholder="CC" class="input-small">
<input type="text" placeholder="Expiry Date"
class="input-small">
</div>
</div>
<br />
<div class="control-group">
<div class="controls">
<button type="submit" class="btn">Submit</button>
</div>
</div>
</form>
</body>
</html>