Why doesn't margin:auto center an image?

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Answer 1

I've found that I must define a specific width for the object or nothing else will make it center. A relative width doesn't work.

Answer 2

I have found... margin: 0 auto; works for me. But I have also seen it NOT work due to the class being trumped by another specificity that had ... float:left; so watch for that you may need to add ... float:none; this worked in my case as I was coding a media query.