config baseUrl with but got for static file

What version of Hugo are you using ( hugo version )?

$ hugo version v0.88.1-5BC54738

Does this issue reproduce with the latest release?

i’m a new user for hugo , when i use command like this:

hugo server --theme=hyde --buildDrafts --source=/opt/blog --config config.toml --baseUrl=

and set a nginx proxy with port 80 between hugo and browser.
i got css file path eg: in browser html content, but i want get, any config can do this?