Configure SSL certificate via Nginx

[nibras]

I'm running Abntecart through the docker container. I can view the site and admin panel. When I create new order it's saying the connection is not secure. After searching through forums, I have been advised to setup HTTPS communication. I have found nginx SSL configuration in Abantecart GitHub repo. After applying the configuration, I can access the store via HTTPS, but I'm getting a blank page.

[dvagner]

Describe the architecture in more detail. Show docker and nginx config