XF 2.1 Change background?

[Rettep]

Hello! I got a simple question, I want a picture that I have on my PC to be the background of my entire website. How do I do that? A picture that stays as it is when you scroll down the page.


This might be a simple question but I'm new with XenForo. Thanks!

 

[randomchance]

I'd like to know this too, the style I used to copy to do this was for the previous version.