This login module is meant to be shared between a few websites (including declick.org, france-ioi.org).
You can include it in an iframe, and listen to the messages described in this doc.
Clone and:
bower install
composer install
Setup a database and import table structure from user.sql.
Copy config_local_template.php into config_local.php and override the configuration.
Include an iframe in your page, pointing to login.html, it should send messages to the main page through postMessage.
TODO: add a small demo page.