<div class="form-group" align="center">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" id="env" class="btn btn-default">Enviar</button>
</div>
</div>
</td>
<td>
<div class="form-group" align="center">
<div class="col-sm-offset-2 col-sm-10">
<button type="reset" class="btn btn-default" value="Limpar">Limpar</button>
</div>
</div>