I want to have 3 divs aligned inside a container div, something like this:
[[LEFT] [CENTER] [RIGHT]]
Container div is 100% wid
With that CSS, put your divs like so (floats first):
P.S. You could also float right, then left, then center. The important thing is that the floats come before the "main" center section.
P.P.S. You often want last inside #container
this snippet: which will extend
#container
vertically to contain both side floats instead of taking its height only from #center
and possibly allowing the sides to protrude out the bottom.