How to change button color and transparency in PyQt5?

Question

Python

self.b1 = QPushButton(self)
self.b1.setGeometry(QtCore.QRect(3, 447, 294, 50))
self.b1.setText('RUN')
self.b1.clicked.connect(self.show_window_2)
Yes a button that needs to be made transparent or white (change color) and change color when the cursor is hovering over the button)) If you tell me, I will be grateful)) + set the image to this button))