Install existing wordpress site in docker container using nginx as reverse proxy

I struggle to install an existing wordpress website in a docker container. I used docker compose. And all systems (wordpress, nginx, mariadb, dbadmin) come up. I can fully access db admin from the internet, and I also managed to make the website accessible from outside. But the website doesn't load all the ressources, it seems wordpress is not able to access the database properly. I need someone who has experience with wordpress in combination with docker and who is able to create a docker compose file that works for my configuration. The wordpress site is available in the form of the wordpress files plus ans .sql export from the database. The website was delivered from a web designer. I wanted to have it installed in a docker container, that's why I didn't let him do the installation (doesn't know about docker). Docker is already installed on the server (debian), files are already located in I'd prefer a fix price, price is negotiable. Please contact me if you think you have enough experience to install / fix the site quickly.