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QPalette bgpal = palette();
//bgpal.setColor (QPalette::Background, QColor (0, 0 , 0, 255));
bgpal.setColor (QPalette::Background, QColor (255, 255 , 127));
//bgpal.setColor (QPalette::Background, Qt::transparent);
//bgpal.setColor (QPalette::Foreground, QColor (255,255,255,255));
setPalette (bgpal);