How to make one circle inside of another using CSS

Question

I am trying to make one circle inside of another circle using css, but I am having an issue making it completely centered. I am close, but still not there. Any ideas?

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Answer 1

try to give the innercircle a top:50% and than margin-top: a nagative value from the half of the height of the innercircle.

http://jsfiddle.net/972SF/19/