def set_border(self, thickness, color="<STR_LIT>"):
self._set_tk_config("<STR_LIT>", thickness)<EOL>self._set_tk_config("<STR_LIT>", utils.convert_color(color))<EOL>
Sets the border thickness and color.

:param int thickness:
    The thickenss of the border.

:param str color:
    The color of the border.