I have searched for this for ages, and I can't find the answer. All I want is content that fills the entire screen. I have never figured it out and I can't find the answer anywhere.

Now I'm working on this project: linky. In it I have an iframe that should fill the entire screen. But if I set its height to 100% it will fill more than the screen. If I don't enter any width it will end up like it is now.

I'm sorry if this is in the wrong forum, its just that I know there are many css experts here, and I just want the answer now!