A solid red outline.
A dotted blue outline.
An outset green outline.
A solid invert outline.
The color of the outline can also be specified using a hexadecimal value (HEX):
A solid red outline.
A dotted blue outline.
A solid grey outline.
The color of the outline can also be specified using HSL values:
A solid red outline.
A dotted blue outline.
A solid grey outline.