How to change empty editor color?

[Borneq]

I changed all to red, but still is white,...

QPalette pal = tabWidget->palette();
    for (int i=0; i<QPalette::NColorRoles; i++) {
        pal.setColor(QPalette::ColorRole(i), QColor("red"));
    }
    tabWidget->setPalette(pal);

QPalette pal = tabWidget->palette();
    for (int i=0; i<QPalette::NColorRoles; i++) {
        pal.setColor(QPalette::ColorRole(i), QColor("red"));
    }
    tabWidget->setPalette(pal);

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