docker-compose file for nginx-proxy with acme-companion

docker-compose.yml

version: "3"
services:
  nginx-proxy:
    image: jwilder/nginx-proxy
    container_name: nginx-proxy
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - certs:/etc/nginx/certs
      - vhost:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html

  acme-companion:
    image: nginxproxy/acme-companion
    container_name: acme-companion
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - acme:/etc/acme.sh
      - certs:/etc/nginx/certs
      - vhost:/etc/nginx/vhost.d
      - html:/usr/share/nginx/html
    environment:
      DEFAULT_EMAIL: [email protected]
      NGINX_PROXY_CONTAINER: nginx-proxy

volumes:
  certs:
  vhost:
  html:
  acme:

networks:
  default:
    external:
      name: nginx-proxy

And then how do you add your own actual application here?