When I create a project with the command:

symfony new --webapp 'projectname' 

and make a default home controller with the command

symfony console make:controller

the background of the controller is blueish, cyan. What does this mean? I expect a white background like in the various tutorials.
I don’t have dark mode on in windows or in the browser. It is on varios browsers the same blue.

Turn of dark mode in windows and the browsers.