[Python] Alignment in PyQt5

I've been trying to learn PyQt5 and decided to do some small project. I'm trying to make a guessing game, where you type in a value and the program says if it's correct. My problem is that I centered my label in a layout part, so it appears at the center bottom of its container, but I want it to be at the center of the page when the button is clicked. I believe that after the button is clicked, the label appears at the bottom of the page due to main_layout.addWidget(self.label, alignment=Qt.AlignmentFlag.AlignBottom| Qt.AlignmentFlag.AlignJustify). Here's the code:

import sys
import time

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *

class MainWindow(QMainWindow):
def __init__(self):
super().__init__()

#fonts
QFontDatabase.addApplicationFont("fonts\Evangelie.ttf")
QFontDatabase.addApplicationFont("fonts\Bebas_Neue_Cyrillic.ttf")
QFontDatabase.addApplicationFont("fonts\MontserratAlternates-Medium.ttf")
QFontDatabase.addApplicationFont("fonts\MontserratAlternates-Bold.ttf")
QFontDatabase.addApplicationFont("fonts\MontserratAlternates-SemiBold.ttf")

#labels
self.label = QLabel("Скільки чулувіків має крапка?", self)
self.line_edit = QLineEdit(self)
self.button = QPushButton("Відповісти.", self)

self.initUI()

def initUI(self):
central_widget = QWidget()
self.setCentralWidget(central_widget)

#region main window
self.setWindowTitle("Guess.")
self.resize(800,700)
self.setStyleSheet("background-color: #697565;")
#endregion

#region label
self.label.setFont(QFont("Montserrat Alternates SemiBold", 24))
self.label.adjustSize()
self.label.setStyleSheet("margin: 0, 20, 0, 0;" \
#"background-color:red;"
"color: #ECDFCC;"
"font-style: bold;"
)
#endregion

#region line_edit
self.line_edit.setFixedSize(200, 80)
self.line_edit.setAlignment(Qt.AlignmentFlag.AlignCenter)
self.line_edit.setFont(QFont("Montserrat Alternates SemiBold", 20))
self.line_edit.setStyleSheet("background-color: #181C14;" \
"color: #697565;" \
"border-radius: 15px;" \
"margin: 0,20,0,0;")
#endregion

#region button
self.button.setStyleSheet("border-radius:15px;" \
"background-color: #ECDFCC;" \
"color: #181C14;")
self.button.setFixedSize(150,50)
self.button.setFont(QFont("Montserrat Alternates Medium", 10))
self.button.clicked.connect(self.on_click)
#endregion

#region layout
main_layout = QVBoxLayout()

main_layout.addWidget(self.label, alignment=Qt.AlignmentFlag.AlignBottom| Qt.AlignmentFlag.AlignJustify)
main_layout.addWidget(self.line_edit, alignment=Qt.AlignmentFlag.AlignHCenter|Qt.AlignmentFlag.AlignJustify)
main_layout.addWidget(self.button, alignment=Qt.AlignmentFlag.AlignJustify | Qt.AlignmentFlag.AlignTop)

central_widget.setLayout(main_layout)
#endregion

#region button clicked
def on_click(self):
self._answer = self.line_edit.text()
print(self._answer)

if(self._answer == '0'):
self.label.setText("You won!")

self.line_edit.hide()
self.button.hide()

self.label.setAlignment(Qt.AlignmentFlag.AlignCenter)
#endregion



def center(self):
frame_geometry = self.frameGeometry()
screen_center = QDesktopWidget().availableGeometry().center()
frame_geometry.moveCenter(screen_center)
self.move(frame_geometry.topLeft())

def main():
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())


if __name__ == "__main__":
main()


I've tried using setAlignment method for a label, but it didn't help.

Any help would be greatly appreciated.



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