<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>Login</legend>
<div class="form-group">
<label class="col-md-4 control-label" for="textinput">Usuário:</label>
<div class="col-md-2">
<input id="textinput" name="textinput" type="text" placeholder="" class="form-control input-md">
<span class="help-block">Digite o seu usuário</span>
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="passwordinput">Senha:</label>
<div class="col-md-2">
<input id="passwordinput" name="passwordinput" type="password" placeholder="" class="form-control input-md">
<span class="help-block">Digite sua senha</span>
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="singlebutton"></label>
<div class="col-md-4">
<button id="singlebutton" name="singlebutton" class="btn btn-primary">Autenticar</button>
</div>
</div>
