Hi

It seems that i have a similar problem.
When i watch the source code the css seems to be in the selfoss root folder.

<link rel="stylesheet" href="all.css">

but i'm on my.url/selfoss

The all.css file is generated (then directories are writeable)

but the URL is wrong. The web server is nginx.

Maybe with base_url inside the config.ini file it's possible to do something.