Html not loading stylesheet - running in docker container

My version of HedgeDoc is: 1.7.2

What I expected to happen:
When accessing my hedgedoc homepage I expect to see a styled pretty page.

What actually happened:
Hedgedoc is up and running, and I see this:

I have installed following the docker installation guide and used the default nginx settings (but for now skipping the ssl part) from here:

Well, I am not completely sure why thing started working, but they did.

  - CMD_DOMAIN=<my-actual-fqdn>
  - CMD_PORT=3000

These are the ENV values I ended up with. And after a reboot and bringing things up again it works nicely.

So closing the case!