Dynamically Centering a Div

Question

I went to MSDN and Google Coding, and they both give the same example. They say you can center a div like this, but it doesn't work. Anybody knows why? I also would like to know the best way to center a div. I tried to do margin: 0 auto; it didn't work.

Answer 1

The div must be given an defined width in order for the margin trick to work: link

<div style='width:800px;margin:0 auto;'>Div Middle</div>