<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<form class="form-horizontal">
<fieldset>
<legend>SALE</legend>
<div class="form-group">
<label class="col-md-4 control-label" for="product_id">PRODUCT ID</label>
<div class="col-md-4">
<input id="product_id" name="product_id" placeholder="PRODUCT ID" class="form-control input-md" required="" type="text">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="customer_id">CUSTOMER ID</label>
<div class="col-md-4">
<input id="customer_id" name="customer_id" placeholder="CUSTOMER ID" class="form-control input-md" required="" type="text">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="customer_name">CUSTOMER NAME</label>
<div class="col-md-4">
<input id="customer_name" name="customer_name" placeholder="CUSTOMER NAME" class="form-control input-md" required="" type="text">
</div>
</div>