PyQt5 Tabwidget tab bar blank area background color

Question

hi everyone , how to fill background color in empty space tab bar area. i checked this link: how to change background color for qtabbar empty space pyqt , but not success.

here is my stylesheet:

    self.tabWidget.setStyleSheet('''
            QTabBar::tab{padding: 0px;}
            QTabBar::tab { height: 150px; border: 1px solid #FFFFFF;}
            QTabBar::tab {background-color: rgb(34, 137, 163);color: white;}

            QTabBar::tab:selected {background-color: rgb(48, 199, 184,);
                color: #000000
            }

            QTabWidget>QWidget>QWidget{background: WHITE;}
            QTabWidget>{background: WHITE;}

            QTabWidget::pane {top: 0px;}
            QTabWidget::tab-bar {right: 0px;}
            QTabBar { background: transparent; }
        ''')

Answer 1

It depends on the documentMode .

If it's False (the default), you have to set the TabWidget background, and ensure that its autoFillBackground() is set to True; this is very important, as Qt automatically unselect it when setting a stylesheet.
Note that, in this case, the background will be "around" the whole tab widget too, if don't want it, just disable the border.

    self.tabWidget.setStyleSheet('''
        QTabWidget {
            background: magenta;
            border: none;
        }
        QTabBar::tab {
            background: green;
        }
    ''')

If the document mode is on, instead, you can just set the background for the tab bar:

    self.tabWidget.setStyleSheet('''
        QTabBar {
            background: magenta;
        }
        QTabBar::tab {
            background: green;
        }
    ''')