Inherited
Inherited represents an option value to be inherited from an enclosing style, cell, or notebook.
This is used to specify that a property should take its value from the parent context rather than being explicitly set.
Examples
Style["text", FontColor -> Inherited]Cell["content", Background -> Inherited](* Use inherited option in a cell *)
Cell[BoxData["x"], CellFrame -> Inherited]*See the official Wolfram Language Reference for more details.