Backround-color for a styledpannel | sunken QLabel

I would like to set a particular color to the sunken part of the design, that is to say a color following the inside part of the box. If I     whateverqlabel->setStyleSheet("QLabel { background-color : red; color : blue; }");     whateverqlabel->setFrameStyle(QFrame::StyledPanel|QFrame::Sunken); Then I obtain the whole box drawn onto an evil bigger background-colored rectangle.