Hi, To add to @mrjj, the styles are free to ignore the palette or certain elements of the palette.

Please share any bug report you are opening so that other may find them more easily.

@Lays147 If only you want changed background color for QGraphicsScene, then: scene()->setBackgroundBrush(palette().window());

Ok, I just realized that I was asking for QPalette::Window of the widget itself, not the application. Nothing wrong with being stupid.

I understand you want to use the palettes but just as a note - you can also style a widget by name and that way override the color. QPushButton#TheWidgetName { background-color: qlineargradient(spread:pad, x1:0, y1:0, x2:1, y2:1, stop:0 rgba(255, 255, 255, 0)); }

OK, I found a solution. Two methods have to be called in reverse order. QStyle *style = QStyleFactory::create(styleName); QApplication::setPalette(style->standardPalette()); QApplication::setStyle(style); And now it works as desired. Tomas

Did two thing. Using recommended code below, compilation Error appear ->"The program has unexpectedly finished" QImage myImage; myImage.load(":/file/rightp.png"); myImage.scaled(1366,254, Qt::IgnoreAspectRatio, Qt::SmoothTransformation); How to scale stylesheet to 1/4 of mainwindow using below code MainWindow w; w.setStyleSheet("background-image:url(./file/left.png)"); w.show();