Setting up error page for traefik and it's applications

docker-compose.yml

app:
    image: my/webapp:latest
    labels:
      - "traefik.enable=true"
      - "traefik.frontend.rule=Host:supercoolapp.com"
      - "traefik.frontend.errors.network.backend=error"
      - "traefik.frontend.errors.network.query=/{status}.html"
      - "traefik.frontend.errors.network.status=500-511"
      - "traefik.port=3000"
  error_pages: 
    image: my/error-pages:latest
    labels:
      - "traefik.enable=true"
      - "traefik.frontend.rule=HostRegexp:{catchall:.*}"
      - "traefik.frontend.priority=1"
      - "traefik.backend=error"
      - "traefik.port=80"