how to center an inline div using css?

Question

How can I center an inline div (not its content) using css?

VERY IMPORTANT: the width of the div is unknown (I can not specify it)

Answer 1

you can probably get away with display:inline-block and text-align:center; on the parent element if you want it it to be "blocky". also you'll probably need to give it a vertical-align:top