The phrase "black overlay" refers to a dark layer or covering that is placed on something, usually to make certain parts or features more prominent or noticeable.
Sentences with «black overlay»
The way it works is simple: it draws an entirely black overlay above the status bar but below the other status bar elements. (xda-developers.com)
And the beige colour scheme with black overlays looked rather cool. (auto.ndtv.com)
The breed can be recognized by its thick mahogany - colored coat with varying degrees of black overlay, and a black mask. (wideopenpets.com)