The green box appear angled out from the yellow box and embedded in it.

-webkit-transform: translateZ(-100px) rotateY(45deg);
(GraphicsLayer
  (anchor 0.00 0.00)
  (bounds 800.00 600.00)
  (children 1
    (GraphicsLayer
      (bounds 800.00 600.00)
      (contentsOpaque 1)
      (children 1
        (GraphicsLayer
          (position 108.00 73.00)
          (bounds 304.00 304.00)
          (childrenTransform [1.00 0.00 0.00 0.00] [0.00 1.00 0.00 0.00] [0.00 0.00 1.00 -0.00] [0.00 0.00 0.00 1.00])
          (children 1
            (GraphicsLayer
              (position 12.00 12.00)
              (bounds 280.00 280.00)
              (opacity 0.80)
              (contentsOpaque 1)
              (preserves3D 1)
              (drawsContent 1)
              (transform [0.77 -0.56 -0.32 0.00] [0.00 0.50 -0.87 0.00] [0.64 0.66 0.38 0.00] [0.00 0.00 0.00 1.00])
              (children 1
                (GraphicsLayer
                  (position 40.00 40.00)
                  (bounds 200.00 200.00)
                  (opacity 0.70)
                  (contentsOpaque 1)
                  (drawsContent 1)
                  (transform [0.77 0.00 0.64 0.00] [0.00 1.00 0.00 0.00] [-0.64 0.00 0.77 0.00] [0.00 0.00 50.00 1.00])
                )
              )
            )
          )
        )
      )
    )
  )
)