I finally figured out how to use WP with my own design, but I've run into a little problem.
This is what I want my design to look like (I designed & coded it, then checked if it was working before integrating it with WP and it did work).
Unfortunately, this is what my design looks like when I integrated it with WP.
Here is my CSS.
I've spent about 7 hours non-stop trying to figure this out, but I can't, so any help would be much appreciated.