The ui app.css 404

[seepine]

version: '3'
services:
  api:
    image: iron/functions
    volumes:
      - api_data:/app/data
      - /var/run/docker.sock:/var/run/docker.sock
    ports:
      - 8080:8080

  ui:
    image: iron/functions-ui
    environment:
      API_URL: http://api:8080
    ports:
      - 4000:4000

volumes:
    api_data:

[ajaysourcedigital]

same error.