<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="container">
<div class="row">
<h2>Create your snippet's HTML, CSS and Javascript in the editor tabs</h2>
</div>
<form action="#">
<div class="row">
<div class="col-md-3">
<div class="form-group form-group-sm">
<label for="firstname" class="control-label">Firstname1</label>
<input type="text" class="form-control" id="firstname" placeholder="Firstname">
</div>
</div>
<div class="col-md-3">
<div class="form-group">
<label for="lastname" class="control-label">Last Name2</label>
<input type="text" class="form-control" id="lastname" placeholder="Last Name">
</div>
</div>
<div class="col-md-3">
<div class="form-group">
<label for="lastname" class="control-label">Last Name3</label>
<input type="text" class="form-control" id="lastname" placeholder="Last Name">
</div>
</div>
</div>
<div class="row">
<div class="col-xs-3">
<textarea class="form-control"></textarea>
</div>
</div>
<div class="row">
<div class="col-xs-3">
