Remove or make the entire player transperant

Hi all

I have problems with making the entire player transeperant. In Colors & Effects everything is set to transparency 100% but I still got a white border. It's ok if the border is the same size all around but it's not. The bottom border where the seekbar and buttons used to be are very large. So any idea how to remove it?

I have done this but don't remember how.


(I attached a picture to show what I mean)

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