How to Apply stylesheet to QMessageBox?

Hi All,
i need to apply background color as gray in messagebox;
i wrote like

Code:

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QMessagebox msg(this);
msg.setStyleSheet("background-color: gray ; color : gray");

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But its not working. Can any body help me?

Hi All,
i soved this problem. Created a pointer to QMessagebox in header file, and applied stylesheet to it.