Docker newbie - need short help

I have created a container according to these instructions

docker pull vaultwarden/server:latest
docker run -d --name vaultwarden -v /vw-data/:/data/ --restart unless-stopped -p 80:80 vaultwarden/server:latest

I just don’t know now how to get to the Vaultwarden admin via the browser,
since I only have an internal Docker IP address?

You use the IP address of the docker host system, not the container ip.