Hi @SgtFuturess 
,
Did you installed pasbolt on your CentOS 7 with our RPM package or with installation scripts ?
If you are using our RPM package, you should be able to reconfigure the nginx part with /usr/local/bin/passbolt-configure script, as described here: Passbolt Help | How to configure HTTPS with RPM package
Reply no to mariadb questions, as there is no need to create the DB as it already exists, but you can reconfigure the nginx part.
Let me know if you have further questions.
Best regards,