CSS OUTLINE-COLOR

The ‘outline-color’ property specifies a color for the outline for an element.
The outline properties create a uniform line around an object in order to draw visual attention. An outline is slightly different than a border in several ways: An outline is drawn starting “just outside the border edge” and is allowed to be non-rectangular. Outlines are always rendered on TOP of an element’s rendering box and do not influence the box’s position or size calculation; the document does not need to be re-flowed when a border is rendered or hidden, but the outline may overlap other nearby elements.


Example
img { outline-color: black }

Possible Values
Value Description
inherit Explicitly sets the value of this property to that of the parent
invert This value inverts the color of the outline to the opposite value of the color “underneath” the outline to ensure proper contrast
color Sets the border to the indicated color value