outline-width

The CSS outline-width property sets the thickness of an element’s outline. An outline is a line that is drawn around an element, outside the border.

It is often more convenient to use the shorthand property outline when defining the appearance of an outline.

Values: <line-width> Defines the width of the outline, either as an explicit non-negative <length> or the keywords: thin, medium, or thick. The default is medium.

Syntax example: outline-width: thin;