I answered your other thread about the logs, so with regards to the other two questions:
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You can have local copies of CSS in
/opt/rt5/local/static/css. There’s some documentation on CSS tweaking here too: Customizing/Styling rt - RT 5.0.6 Documentation - Best Practical -
Some folk have tried mod_auth_openidc with Apache: OpenId Authentication agains Azure AD and Azure AD Authentication for RT - #16 by ChrisF