pyQt5 QCalendarWidget setHeaderTextFormat

[zazen000]

As written displays widget with a black background (what I want) except for the outer frame and the horizontal header. want to make the entire widget with black background. I cannot get the syntax right. Any suggestions? Thank you.

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from PyQt5.QtWidgets import QApplication, QPushButton, QWidget, QDialog, QVBoxLayout, QCalendarWidget, QLabel import sys from PyQt5 import QtGui from PyQt5.QtCore import Qt, pyqtSlot from PyQt5.QtGui import QTextCharFormat, QBrush, QColor, QTextFormat   class Window(QDialog):      def __init__(self):         super().__init__()         self.left = 700         self.top = 500         self.width = 100         self.height = 75         self.setGeometry(self.left, self.top, self.width, self.height)         self.setWindowFlags(Qt.FramelessWindowHint)         self.Calendar()           self.show()      def Calendar(self):        vbox =  QVBoxLayout()        format = QTextCharFormat()        self.calendar = QCalendarWidget()        self.calendar.setHorizontalHeaderFormat(QCalendarWidget.SingleLetterDayNames)        self.calendar.setVerticalHeaderFormat(QCalendarWidget.NoVerticalHeader) #       self.calendar.setHeaderTextFormat(format.setBackground(Qt.black))        self.calendar.setSelectionMode(QCalendarWidget.NoSelection)        self.calendar.setStyleSheet("background-color: black; color: rgba(162, 201, 229, 255); ")        vbox.addWidget(self.calendar)        self.setLayout(vbox)   if __name__ == '__main__':     app = QApplication(sys.argv)     window = Window()     sys.exit(app.exec_())