QDialog border inherited by child QCheckBox

[Captain Haddock]

I create a custom QDialog and specify a border in the stylesheet. The dialog has a QCheckBox that I have increased in size. The dialog border style also gets applied to the QCheckBox .. how can I stop the border being applied to the checkbox?

import sys
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

class MyDialog(QDialog):

    def __init__(self, parent=None):
        super(MyDialog, self).__init__(parent)
        self.setFixedSize(400, 400)
        self.setStyleSheet("background-color:#4C535D;border-style:solid;border-color: #E1D8FF;border-width:2px;border-radius:6px")
        self.myCheckBox = QCheckBox()
        self.myCheckBox.setStyleSheet("QCheckBox::indicator { width: 30px; height: 30px }")
        layout = QHBoxLayout()
        layout.addWidget(self.myCheckBox)
        self.setLayout(layout)

def window():
    app = QApplication(sys.argv)
    w = QWidget()
    btn = QPushButton(w)
    btn.setText("Choose Me")
    btn.move(100,50)
    btn.clicked.connect(showdialog)
    w.setWindowTitle("PyQt Dialog demo")
    w.show()
    sys.exit(app.exec_())

def showdialog():
    dlg = MyDialog()
    dlg.setWindowTitle("Dialog")
    dlg.setWindowModality(Qt.ApplicationModal)
    dlg.exec_()


if __name__ == '__main__':
    window()

[JonB]

@Captain-Haddock

self.setStyleSheet("MyDialog { background-color:#4C535D; ... }")

I believe should prevent that inheritance?