code: def _grid_widgets(self):
          
          self._canvas.grid(sticky="nswe")
          self.header_label.grid(row=1, column=1, sticky="nswe", pady=5, padx=5)
          self.text_label.grid(row=3, column=1, sticky="nswe", pady=6, padx=5)
docs: Place the widgets in the Toplevel.