Fixed Wide Screen Viewing

The previous usage of container seemed to cause quirky behavior with
really wide screens, due to the difference in stretching between the
header and the list items.

Adding container to the body seems to have prompted a fixed width
layout. Not sure why honestly, Neat is still a bit of a mystery to me,
but hey.. my HTML is clean, so yay lol.
Updated 501
Shrunk the Message Size a bit
Added a 404

Which is funny, because i can't possibly use a 404.