Website looks defect

My version of HedgeDoc is: 1.9.7

What I expected to happen: A good looking start page

I tried to install HedgeDoc using Portainer. I read through the howto but I am not able to find a solution. I simply want to connect to my HedgeDoc via Port 3030 (3000) without SSL

What actually happened:

I am trying to install HedgeDoc via Portainer. I have to the problem that the start page does not look good all images are missing. I know that there is a hint on the webpage that I need to find out the correct configuration but I was still not able to fix the issue.

I already tried all possible combinations of CMD_URL_ADDPORT and CMD_PROTOCOL_USESSL

I already tried:

version: '3'
services:
  database:
    image: postgres:13.4-alpine
    environment:
      - POSTGRES_USER=hedgedoc
      - POSTGRES_PASSWORD=password
      - POSTGRES_DB=hedgedoc
    volumes:
      - database:/var/lib/postgresql/data
    restart: always
  app:
    # Make sure to use the latest release from https://hedgedoc.org/latest-release
    image: quay.io/hedgedoc/hedgedoc:1.9.7
    environment:
      - CMD_DB_URL=postgres://hedgedoc:password@database:5432/hedgedoc
      - CMD_DOMAIN=<my resolvable fqdn>
      - CMD_URL_ADDPORT=true
      - CMD_PROTOCOL_USESSL=false
    volumes:
      - uploads:/hedgedoc/public/uploads
    ports:
      - "3030:3000"
    restart: always
    depends_on:
      - database
volumes:
  database:
  uploads:

Today I tired to use the IP address instead of the FQDN but it the result is always the same.
Even the option CMD_Port=3030 didn’t help.