<div class="row d-flex justify-content-center">
    <div class="col-lg-8">
        <div class="row d-flex justify-content-center">
            <div class="col-lg-6">
                <form id="doisfatores">
                    <div class="form-group">
                    <label for="code_auth">Código de Verificação</label>
                        <input class="form-control" type="text" name="code_auth" placeholder="Digite o Código" autofocus required="required">
                        <input type="hidden" name="secret_auth" value="<?php echo $secret; ?>">
                    </div>
                    <div class="form-group mt-2 mb-2">
                        <div class="text-right">
                            <button class="btn btn-primary" style="margin-top:5px;" type="submit">Verificar</button>
                        </div>
                    </div>
                </form>
                <div class="result"></div>
            </div>
        </div>
    </div>
</div>