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#!/usr/bin/python

import os
import sys
from PyQt5.QtWidgets import (
    QWidget,
    QPushButton,
    QHBoxLayout,
    QVBoxLayout,
    QApplication
    )

class ButtonBar(QWidget):

    def __init__(self):
        super(ButtonBar, self).__init__()

        hbox = QHBoxLayout()
        hbox.addStretch(1)
        for button in ['Ok', 'Cancel']:
            btn = QPushButton(self)
            btn.setText(button)
            btn.clicked.connect(self.senderContactButton)
            hbox.addWidget(btn)

        vbox = QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox)
        self.buttonBarLayout = vbox

        self.setLayout(self.buttonBarLayout)
        self.setGeometry(300, 300, 300, 150)
        self.setWindowTitle('Buttons')
        self.show()


    def senderContactButton(self):
        button = self.sender()
        print("button: ", button.text())

def main():

    app = QApplication(sys.argv)
    ex = ButtonBar()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

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QPushButton {
background-color: rgb(169,169,169); 
color: rgb(255,255,255);
}
QPushButton:pressed {
background-color : rgb(169,169,169);
color: rgb(255,255,255);
}
QPushButton:hover {
background-color : lightgreen;
color: black;
}

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QPushButton:focus {
border: none;
outline: none;
}