How do I make ny site borders wider? I open up a page and it's only down the middle of the page. How can I make it so it takes up the whole screen when opened in a window? Please.. ..... somebody help me.
That effect can only be achieved by positively doing something not by default.
Either you explicitly coded it or you made a positive choice to use a template that did.
There are several different ways in which this effect can be achieved, as you haven't given us a link so we can look at the code we don't know which one was used. Without that piece of information we can't tell you what needs changing.