Rotate image around center css3

you need to set the size of the element and specify the transform-origin property

-webkit-transform-origin: 50% 50%;
-moz-transform-origin: 50% 50%;
-o-transform-origin: 50% 50%;
transform-origin: 50% 50%;
width: 256px;
height: 256px;

Example fiddle : http://jsfiddle.net/RbXRM/3/