CSS Transform Not Working in Ie 8

CSS Transform not working in IE 8

If you see your "filter:" rotation to 3, it will give a 270 degree rotation in IE 8 (and downward to v5.5, IIRC).

http://msdn.microsoft.com/en-us/library/ms532918(v=vs.85).aspx

css transform rotate not working in ie8 even after implementing filter

To rotate by 45 degrees in IE, you need the following code in your stylesheet:

filter: progid:DXImageTransform.Microsoft.Matrix(sizingMethod='auto expand', M11=0.7071067811865476, M12=-0.7071067811865475, M21=0.7071067811865475, M22=0.7071067811865476); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.Matrix(SizingMethod='auto expand', M11=0.7071067811865476, M12=-0.7071067811865475, M21=0.7071067811865475, M22=0.7071067811865476)"; /* IE8 */

See here for more detail:

https://stackoverflow.com/a/4617511/2161568

CSS3 transform property working differently in Internet Explorer

Easier Approach

Instead of positioning from the top and left, position instead from the bottom and right. After you've done this, simply change your -50% translations to positive 50%. This will remove the overflow e.g.

.center-center {
    position: absolute;
    bottom: 50%;
    right: 50%;
    transform: translate(50%, 50%);
}

You can see these changes in action here: http://jsfiddle.net/bd17gsss/

It's worth noting that this bug is still filed, and our team will still give it the appropriate consideration when time and cycles permit us to do so.

Original Answer

There appears to be a layout bug with position: absolute in this particular demo. It's behaving similar to position: relative when it shouldn't be. I've opened a bug on this issue for the Internet Explorer team to investigate further.

For now, you could switch your position value from absolute to fixed, which appears to render the centered element correctly. This prevents you from having to use a fixed set of dimensions over and over, and instead allows you to use this approach as a general-purpose .modal style class that will center anything it is applied to.

The obvious caveat with this change is that your element is positioned according to the viewport, and no longer the document itself. This will freeze it on the screen effectively.

.modal {
    position: fixed;
    top: 50%; left: 50%;
    background-color: red;
    transform: translate(-50%, -50%);
}

To demonstrate the success this approach has with various dimensions, we can cycle through a few example sets and test the rendering of the element to ensure it is properly centered:

(function () {

    var xandy,
        index = 0,
        modal = document.querySelector( ".modal" ),
        sizes = [
            { x: "50%"  , y: "30%"   },
            { x: "400px", y: "288px" },
            { x: "25vw" , y: "75vh"  },
            { x: "90%"  , y: "90%"   }
        ];

    setInterval(function changeSize () {
        xandy = sizes[ index++ % sizes.length ];
        modal.style.width = xandy.x;
        modal.style.height = xandy.y;
    }, 1000 );

}());

The end-result can be viewed online here: http://jsfiddle.net/jonathansampson/c00u5ev8/

rotate(-90deg) not work IE8

Sadly, IE8 does not support CSS3, which includes transform, etc.. You should either upgrade your browser (to at least IE9), or switch to another, more modern one, like Chrome or Firefox. Alternatively, you can use a polyfill.

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