The color of the element's bottom side of the border.
Promptable? YES
Possible Values: Color name or hex value
Valid colors by name : aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, and yellow. All other colors must be specified using a hex value (ex: #FF0000).
Bindable? YES
Product: ProfoundUI, Genie