<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>Cadastro</legend>
<div class="control-group">
<label class="control-label" for="nome">Nome</label>
<div class="controls">
<input id="nome" name="nome" type="text" placeholder="Digite seu nome" class="input-large" required="">
</div>
</div>
<div class="control-group">
<label class="control-label" for="Email">E-mail</label>
<div class="controls">
<input id="Email" name="Email" type="text" placeholder="Digite seu e-mail" class="input-large" required="">
</div>
</div>
<div class="control-group">
<label class="control-label" for="enviar"></label>
<div class="controls">
<button id="enviar" name="enviar" class="btn btn-primary">Enviar</button>
</div>
</div>