lineBorder
Sets a line border thickness pixels wide in color. The border is rebuilt only when color or thickness changes, so a chain that recomposes often leaves the component's border alone. See border for the one border a chain declares.
Return
this chain with the line border declared on it.
Parameters
color
the color of the line drawn just inside the component's edges.
thickness
how many pixels the line takes from each side, 1 by default.