Style: The style of the border.
"STYLE_UNSPECIFIED" - The style is not specified. Do not use this. "DOTTED" - The border is dotted. "DASHED" - The border is dashed. "SOLID" - The border is a solid line. "NONE" - No border.
Used only when updating a border in order to erase it.
"DOUBLE" - The border is two solid lines.