With Focusingly, focus styling adapts to match and fit individual elements.
No configuration required, Focusingly figures it out. The result is a pleasingly tailored effect that subtly draws the eye.
The idea is that if a link color (or whatever focusable element) is red, the outline will be red too, instead of that fuzzy light blue which might be undesirable aesthetically.
“a more visually-pleasing focus” is a post from CSS-Tricks