<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="row">
<div class="col-md-4 col-md-offset-4">
<form class="form-horizontal" role="form">
<fieldset>
<legend>Address Details</legend>
<div class="form-group">
<label class="col-sm-2 control-label" for="textinput">Line 1</label>
<div class="col-sm-10">
<input type="text" placeholder="Address Line 1" class="form-control">
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" for="textinput">Line 2</label>
<div class="col-sm-10">
<input type="text" placeholder="Address Line 2" class="form-control">
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" for="textinput">City</label>
<div class="col-sm-10">
<input type="text" placeholder="City" class="form-control">
</div>
</div>