What's the colour?

If we put 3 pieces of standard polarised glasses together on the top of a intense white light source .2 pieces are overlapped - one vertically(not standing up!) placed on the top ,one horizontally at the bottom).The other one is rotated 45˚ and placed between the two. What will the colours be respectively in the middle(on the rotated one) and along the margin(out of the rotated one)?

Note:
1. The third one is slightly smaller than the others so that it can leave some margin.
2. The light source is wide enough to cover all the 3 pieces.

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