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.
Instead of relying on margins, you have the option to use:
top: 25%;
left: 25%;
I personally prefer not to mix margins with fixed positioning.
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