[pseudonimble]

Pretty sure you can't have a width of 222.75px, it would be rounded up to the nearest pixel and wouldn't fit in the container.

[superchink]

A relevant SO question and an article for more in-depth analysis:

http://stackoverflow.com/questions/4308989/are-the-decimal-p...

http://ejohn.org/blog/sub-pixel-problems-in-css/