css - How can i set style to QLayout -


i'm trying add stylesheet script using css, looks fine can't set style qlayout. how can change it's background color example of i'm done.

def main_style(self):     self.setstylesheet("""         .qvboxlayout{             background-color: #616161;         }          .qmenubar{             background-color: #212121;             color: #f5f5f5;          }          .qmenu{             background-color: #212121;          }          .qtextedit{             background-color: #424242;             color: #f5f5f5;             border: 1px #9e9e9e solid;         }         """)

the program running no errors , changes happen except qvboxlayout it's still default


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