Help if i want to change the port of nginx, which files should be changed?

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

the default port 80 is occupied, i want change another prot(such as 81), i have changed relevant config in docker-compose.yaml and .env
however, the nginx reproted 404 not found when i visit localhost/install, what other files need to be modified?
docker info:
docker_nginx_1 sh -c cp /docker-entrypoin ... Up 0.0.0.0:443->443/tcp,:::443->443/tcp, 80/tcp, 0.0.0.0:81->81/tcp,:::81->81/tcp

2. Additional context or comments

No response