I tried the css, and it fixed the white space issue (Mostly, except its still there, just much less prominent, but acceptable), but the parallax effect is still unusual looking.
Also, the code only worked when I removed the -moz part. Otherwise, it had no effect. (Yes, both the website and local caches were cleared first)
Thank you though, although it would also be nice to fix the unusual parallax effect.
Thank you again!