def METHOD_NAME(self, widget: QWidget):
    self._animation = QPropertyAnimation(self.mini_effect, b"opacity")
    self._animation.setDuration(250)
    self._animation.setStartValue(0)
    self._animation.setEndValue(1)
    self._animation.setEasingCurve(QEasingCurve.InSine)
    self._animation.start(QPropertyAnimation.DeleteWhenStopped)