CSP is a header in the HTTP response called "content-security-policy"

You can see it by running: curl -I https://blimey.social

Run: curl -I https://gleasonator.com

Compare the content-security-policy header.

You will see the "style" section is different. Mine allows unsafe-inline, yours allows only a single nonce

You need to make it return the correct thing. You can also check the console logs in the browser to see the errors resulting from this.

Paste your Nginx file into ChatGPT and ask how to do it.

I don't want to write up specific instructions on this because I don't want to encourage other people to do it. It's not a good thing. Akkoma has broken support for other frontends. This is an Akkoma problem.