[Interest] QPushButton Background Colour

[Lucas.Betschart at crypto.ch]

Hello,

I made some QPushButton with only a icon. I'd like to have them flat (like the left one in picture 1&2) & with no text.
But when I click on such a flat QPushButton some background colour appears. How can I turn this off?


Normal:


After clicked:



I hope adding pictures to this mail worked.

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