How to set QPdfView's viewport background color

I'm trying to set a QPdfView's viewport background color, but unlike QAbstractScrollArea (from which QPdfView's derived), using stylesheet does not work.

Here's how I tried to do that:

#include <QApplication>#include <QPdfView>int main(int argc, char *argv[]){    QApplication a(argc, argv);    QPdfView *pdfView = new QPdfView();    pdfView->setMinimumSize(100,100);    //I tried to set stylesheet in different ways, in multiple combinations    //but none worked    //pdfView->setStyleSheet("background: white");    pdfView->setStyleSheet("QWidget{background: white;}");    //pdfView->viewport()->setStyleSheet("background: white");    pdfView->show();    return a.exec();}

Note: You need to to find and target PdfWidgets, so modify your CMakeLists.txt according the below, to be able to use QPdfView:

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets PdfWidgets)find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets PdfWidgets)target_link_libraries(MyExperiments PRIVATE     Qt${QT_VERSION_MAJOR}::Widgets     Qt${QT_VERSION_MAJOR}::PdfWidgets)

Here's how it looks, viewport is grey, and you can see the white background of QPdfView on the borders:

I also tried to change the background color of viewport by overriding QAbstractScrollArea::paintEvent, and here's how:

void paintEvent(QPaintEvent *event){    QPdfView::paintEvent(event);    QPainter p(viewport());    QRect rect = viewport()->rect();    rect.adjust(-1,-1,0,0);    p.setBrush(QBrush(QColor(0,0,100)));    p.drawRect(rect);}    

But that ended up painting over viewport, not changing its background color, so it covers open documents, because If I use a transparent color, I can see the document through it.

I'm open to either or other ways, but I'd like to avoid using paintEvent if possible.