Can't change background color of progress bar

[Luca Bertolotti]

Hello
This is my code:
self.lista_progress[a].setMaximum(100)
self.lista_progress[a].setValue(int(v))
self.lista_progress[a].setStyleSheet("QProgressBar {background-color:
black;}")
self.lista_progress[a].setStyleSheet("QProgressBar::chunk
{background-color: green;}")

Where self.lista_progress is a list of progressbar , but only the line
self.lista_progress[a].setStyleSheet("QProgressBar::chunk
{background-color: green;}")
work
the line
self.lista_progress[a].setStyleSheet("QProgressBar {background-color:
black;}")
don't make anything
What is wrong
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