set QApplication default font using qss

[lni]

Hi,

I am trying to set QApplication default font using following qss, but it doesn't work. How can I do that? Thanks

QApplication {
  font-family: Arial;
  font-size: 12px;
  font-weight: Normal;
}

QApplication {
  font-family: Arial;
  font-size: 12px;
  font-weight: Normal;
}

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