[eluser]jedd[/eluser]
header.php and home.php are custom files from your previous developer(s) - they're not something that ship with CI.
Similarly, all your CSS are belong to you.
So, really, there's not much we can offer here as far as styling goes. By definition this is done in views (with a reliance on stylesheets too, of course, and any js or other gumpf that was thrown into the mix). You probably, therefore, want to focus on the views sub-directory while also looking for the stash of .css files.
If the site was coded badly, though, you might find html embedded within the controllers .. in which case, even more bets are off.
For future projects, it's always good to demand documentation be shipped with the final product. I know, you've got other things on your mind, but when you've resolved this problem you'll have something else on your mind, too, and the same problem will recur in a few months down the track.
