code: def set_colors(self, text='black', background='white'):
          
          if self._multiline: self._widget.setStyleSheet("QTextEdit {background-color: "+str(background)+"; color: "+str(text)+"}")
          else:               self._widget.setStyleSheet("QLineEdit {background-color: "+str(background)+"; color: "+str(text)+"}")
docs: Sets the colors of the text area.