Exit button not working

I'm using one of the buttons from Lectora's library. When I open it in Lectora's Image Editor I see the white background in the background. Any ideas on removing this background or making the background transparent? I'm using one of the buttons from Lectora's library. When I open it in Lectora's Image Editor I see the white background in the background. Any ideas on removing this background or making the background transparent?

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