<keyline>¶ The <keyline> CSS type represents a line style used in the keyline rule. Syntax¶ Value Description none No line (disable keyline). thin A thin line. heavy A heavy (thicker) line. double A double line. Examples¶ CSS¶ Vertical { keyline: thin green; } Python¶ # A tuple of <keyline> and color widget.styles.keyline = ("thin", "green")