Raspberry Pi 4 image, root user

Hello,

I just installed a raspberry pi 4 image, and im greeted with a login. What are the credentials. I saw somewhere someone said root has no password but when I login with root and no password I get a credentials error..

Can you screenshot the error?

Even if you login as root, there is nothing to do on the console. All management and setup happens via a browser on another device using http://dvr-server.local