<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<form class="form-horizontal">
<fieldset>
<legend>Usuários</legend>
<div class="form-group">
<label class="col-md-4 control-label" for="nome">Nome</label>
<div class="col-md-5">
<input id="nome" name="nome" type="text" placeholder="Nome da pessoa" class="form-control input-md" required="">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="usuario">Usuário</label>
<div class="col-md-4">
<input id="usuario" name="usuario" type="text" placeholder="Nome do usuário" class="form-control input-md" required="">
<span class="help-block">Tudo junto, sem caracteres especiais</span>
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="email">E-mail</label>
<div class="col-md-5">
<input id="email" name="email" type="text" placeholder="E-mail do usuário" class="form-control input-md" required="">
<span class="help-block">teste@seudominio.com</span>
</div>
</div>
