code: def _update_stylesheet(self, widget):
          
          if is_dark_interface():
              css = qdarkstyle.load_stylesheet_from_environment()
              widget.setStyleSheet(css)
              palette = widget.palette()
              background = palette.color(palette.Window).lighter(150).name()
              border = palette.color(palette.Window).lighter(200).name()
              name = widget.__class__.__name__
              widget.setObjectName(name)
              extra_css = '''
                  {0}#{0} {{
                      background-color:{1};
                      border: 1px solid {2};
                  }}'''.format(name, background, border)
              widget.setStyleSheet(css + extra_css)
docs: Update the background stylesheet to make it lighter.