'Disabling PyQt5 window shadow

There is a very annoying kind of shadow/frame over my PyQt5 window. The window is made as a custom class:

class CustomWindow(QMainWindow):
    def __init__(self):
        super(CustomWindow,self).__init__()
        self.bg = '#FFFFFF'
        self.opacity =1 

    def paintEvent(self, event=None):
        painter = QPainter(self)

        painter.setOpacity(self.opacity)
        painter.setBrush(QColor(self.bg))
        painter.setPen(QPen(QColor(0,0,0)))   
        painter.drawRect(self.rect())

    def config(self, bg, op):
        self.bg = bg
        self.opacity = op

The shadow thing I'm talking about:

You can see that there are thin black lines on the left and upper edges of the window. Does anyone know how to disable them?

python pyqt5

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'Disabling PyQt5 window shadow

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