@SGaist thank your message, i solved it.

I finally got it solved... The fix was: QPushButton { width: 100%; } :- )

@mrjj Thanks, it seems like odd behaviour. So, it uses its native palette, i.e. the palette set either directly or inherited from its parent. I am able to change the colour now, but I am using a C-Style cast, and that's why I am not sure if I should do it. Here is my solution: void GuiStyle::drawPrimitive(QStyle::PrimitiveElement element, const QStyleOption* option, QPainter* painter, const QWidget* widget) const { if(vars[id].customTheme) { if(element == QStyle::PE_PanelLineEdit) { const QStyleOptionFrame* comboOption = qstyleoption_cast<const QStyleOptionFrame*>(option); QStyleOptionFrame newComboOption = *comboOption; newComboOption.palette.setBrush(QPalette::Base, Qt::red); // I am using C-Style cast to get the widget in a non-const pointer and then it's palette again the same way QLineEdit* lineEditPtr = (QLineEdit*)widget; QPalette pal = (QPalette)lineEditPtr->palette(); pal.setColor(QPalette::Text, Qt::green); lineEditPtr->setPalette(pal); QProxyStyle::drawPrimitive(element, &newComboOption, painter, widget); } } else { QProxyStyle::drawPrimitive(element, option, painter, widget); } }

@CJha Since my buttons change icons for different states as well, they are redrawn. If only background color needs to change, reset stylesheet is good enough in your case..

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();