I'm running on Aarch64 so had to build from source as you only seem to have Arm64 containers.

 nginxui: container_name: nginxui build: https://github.com/schenkd/nginx-ui.git volumes: - /opt/nginx:/etc/nginx restart: unless-stopped networks: - internal 

However there is no content in the /static/themes folder in the web app, these means the outline-icons aren't loaded.