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<html lang="en"><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Input Sizing</h2> <p>You can quickly size labels and form controls within a Horizontal form by adding .form-group-lg or .form-group-sm to the div class="form-group" element:</p> <form class="form-horizontal"> <div class="form-group form-group-lg"> <label class="col-sm-2 control-label" for="lg">form-group-lg</label> <div class="col-sm-10"> <input class="form-control" type="text" id="lg"> </div> </div> <div class="form-group form-group-sm"> <label class="col-sm-2 control-label" for="sm">form-group-sm</label> <div class="col-sm-10"> <input class="form-control" type="text" id="sm"> </div>