<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>
<form class="form-horizontal">
<fieldset>
<legend>Form Name</legend>
<div class="control-group">
<label class="control-label" for="idusuario">Usuário:</label>
<div class="controls">
<input id="idusuario" name="idusuario" type="text" placeholder="" class="input-xlarge" required="">
</div>
</div>
<div class="control-group">
<label class="control-label" for="nomeusuario">Nome:</label>
<div class="controls">
<input id="nomeusuario" name="nomeusuario" type="text" placeholder="" class="input-xlarge" required="">
</div>
</div>
<div class="control-group">
<label class="control-label" for="sobrenomeusuario">Sobrenome:</label>
<div class="controls">
<input id="sobrenomeusuario" name="sobrenomeusuario" type="text" placeholder="" class="input-xlarge" required="">
</div>
</div>