gh-fork-ribbon.ie.css

/* IE positioning hack (couldn't find a transform-origin alternative for IE) */
.github-fork-ribbon {
    top: -22px;
    right: -22px;
}


/* IE voodoo courtesy of http:https://stackoverflow.com/a/4617511/263871 and
 * http:https://www.useragentman.com/IETransformsTranslator */
.github-fork-ribbon.right {
   /* IE8+ */
   -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=0.7071067811865474, M12=-0.7071067811865477, M21=0.7071067811865477, M22=0.7071067811865474, SizingMethod='auto expand')";
   /* IE6 and 7 */
   filter: progid:DXImageTransform.Microsoft.Matrix(
            M11=0.7071067811865474,
            M12=-0.7071067811865477,
            M21=0.7071067811865477,
            M22=0.7071067811865474,
            SizingMethod='auto expand');
}

.github-fork-ribbon.left {
  /* IE8+ */
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=0.7071067811865483, M12=0.7071067811865467, M21=-0.7071067811865467, M22=0.7071067811865483, SizingMethod='auto expand')";
  /* IE6 and 7 */
  filter: progid:DXImageTransform.Microsoft.Matrix(
           M11=0.7071067811865483,
           M12=0.7071067811865467,
           M21=-0.7071067811865467,
           M22=0.7071067811865483,
           SizingMethod='auto expand');
}