CI3 - place index not in top directory [SOLVED]

localhost
--Marathon Volunteers
----BitBucket
------ci_dev
--------application
----------cache
----------config
----------controllers
----------etc.
--------test
--------vendor
----------codeigniter
------dev.titanvolunteers.com
--------index.php

$system_path = '../ci_dev/vendor/codeigniter/framework/system';
$application_folder = '../ci_dev/application';