adminer on docker compose: How to secure connection?

I am using adminer over nginx-proxy. Relevant docker-compose lines:

version: "3"services:  nginx:    image: "jc21/nginx-proxy-manager:latest"    hostname: websin.space    container_name: npm    restart: always    ports:      - "80:80"      - "81:81"      - "443:443"    volumes:      - ./data:/data      - ./letsencrypt:/etc/letsencrypt  db:    image: mysql:latest    volumes:      - ./db:/var/lib/mysql      - ./init:/docker-entrypoint-initdb.d    restart: always    environment:      MYSQL_ROOT_PASSWORD: doNotTellPasswordsOnStackOverflow      MYSQL_DATABASE: so      MYSQL_USER: so      MYSQL_PASSWORD: doNotTellPasswordsOnStackOverflow  adminer:    image: adminer    restart: always    ports:      - 9080:8080    environment:      ADMINER_DEFAULT_SERVER: db    depends_on:      - db    

Now, when I deploy it, I can connect to the database overhttp://websin.space:9080 as I specified port in the yaml file.

However, I would like to make this connection secure. How can I do that?