A PyQT6 example of a WinUI looking accent button

main.py

import sys
from PyQt6.QtWidgets import QApplication, QPushButton, QMainWindow
from PyQt6.QtCore import QEvent

class WinUIButton(QPushButton):
    def __init__(self, text, parent=None):
        super().__init__(text, parent)
        self.setMouseTracking(True)
        self.installEventFilter(self)
        self.setStyleSheet("""
            QPushButton {
                padding: 7px 12px;
                border-radius: 6px;
                background-color: #0067C0;
                color: white;
                font-size: 11pt;
            }
            QPushButton:hover {
                background-color: #1975C5;
            }
            QPushButton:pressed {
                background-color: #3183CA;
                color: #D1E8FF;
            }
        """)
        self.adjustSize()

    def eventFilter(self, obj, event):
        if event.type() in {QEvent.Type.Enter, QEvent.Type.Leave, QEvent.Type.MouseButtonPress, QEvent.Type.MouseButtonRelease}:
            self.update()
        return super().eventFilter(obj, event)

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("WinUI Styled Button")
        self.setGeometry(100, 100, 400, 300)

        button = WinUIButton("Bing Bang Boom", self)
        button.adjustSize()
        button.move((self.width() - button.width()) // 2, (self.height() - button.height()) // 2)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec())

This can be run with python main.py