Shift+reload to skip the cache, or completely clear your cache altogether, too... CSS stored in separate files tends to get cached by the browser to save bandwidth, so if you make changes to a .css file you may not see them until you get rid of the cached version.
---Jamin
_________________________
Diablo 3 Lead Designer Jay Wilson: “The development of a Blizzard game is sometimes a long affair. This is how long it took us to be ready.”