Strange Firefox behavior with absolutely positioned div and percentage height

One of my projects includes a CSS modal dialog that is structured as follows

div {
  position:fixed;
  top:50%;
  left:50%;
  margin:-26% 0 0 -26%;
  width:46%;
  height:46%;
  padding:3%;
}

Interestingly, this div appears centered in webkit browsers. However, in FF, it appears to be very close to the top of the screen.

Answer №1

Instead of relying on margins, you have the option to use:

top: 25%;
left: 25%;

http://jsfiddle.net/wwRUT/2/

I personally prefer not to mix margins with fixed positioning.

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