My friend, margin-right : auto and margin-left : auto is working but only on on horizontal center not vertical center on the page , if you want both side center (center on the page on any resolution) then this css rule is useless, You can try it and get result

I am not using absolute position frequently, but in Gjm's case I used this position for center div in the page, If you know other that this solution then please post it

Can you please explain your point?

for center DIV You must use Abosolute position instead of relative position in your case .Panel1 { position:absolute; width:125px; height:50px; left:50%; top:50%; margin-left:-62.5px; margin-top:25px; } and use this class