Opening Application UI URL from docker container

Our application is dockerized and we pull those images and create two containers. One is development container and another is database container on AWS instance

Now using .yml file we are able to create the containers and the services are up and running which means our application is deployed in tomcat container. And to verify whether our application is working fine or not we have to open the application UI and check. To open the UI from a browser an ELB is created on AWS, but even both the containers are running perfectly the UI page is not getting opened.

tomcat and postgress are installed as part in containers

Now,is there any particular configuration changes to be done to open the application UI on AWS? please suggest, since the URL is not working