how to change QTextEdit background color ?

[mismael85]

hello,
i am trying to change the background color so i saw the documentation and used the following code

mainText->setAutoFillBackground(true);
	mainText->setPalette(QPalette(QColor(255, 250, 205)));

mainText->setAutoFillBackground(true);
	mainText->setPalette(QPalette(QColor(255, 250, 205)));

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but the background still white.
how can i change the background color?
please help me.
and thank you.