Styling a QProgressBar with a stylesheet

progressbar-styling.py

import sys
from PySide6.QtWidgets import QApplication, QMainWindow, QVBoxLayout
from PySide6.QtWidgets import QWidget, QLabel, QProgressBar, QPushButton
from PySide6.QtCore import Qt, Slot, QTimer


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

        self.setWindowTitle("Progress Bar Styling")
        self.setAttribute(Qt.WA_DeleteOnClose)
        self._progress_label = QLabel("Progress")
        self._progress_max = 10
        self._progress_bar1 = QProgressBar()
        self._progress_bar1.setMinimum(0)
        self._progress_bar1.setMaximum(self._progress_max)
        self._progress_bar2 = QProgressBar()
        self._progress_bar2.setMinimum(0)
        self._progress_bar2.setMaximum(self._progress_max)
        self._quit_button = QPushButton("Quit")
        self._quit_button.clicked.connect(self.close)
        main_layout = QVBoxLayout()
        main_layout.addWidget(self._progress_label)
        main_layout.addWidget(self._progress_bar1)
        main_layout.addWidget(self._progress_bar2)
        central_widget = QWidget()
        central_widget.setLayout(main_layout)
        self.setCentralWidget(central_widget)

        # Style progress bar 2
        stylesheet="""
QProgressBar {
    border: 2px solid grey;
    border-radius: 5px;
    text-align: center;
}

QProgressBar::chunk {
    background-color: #05B8CC;
    width: 20px;
    margin: 0.5px;
}"""
        self._progress_bar2.setStyleSheet(stylesheet)

        self._progress_timer = QTimer()
        self._progress_timer.timeout.connect(self.update_progress)
        self._progress_timer.start(500)

    @Slot()
    def update_progress(self):
        p1 = self._progress_bar1
        p2 = self._progress_bar2
        _max = self._progress_max
        p1.setValue((p1.value() + 1) % (_max+1))
        p2.setValue((p2.value() + 1) % (_max+1))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main_window = Window()
    main_window.show()
    sys.exit(app.exec())