how to give border color to slider img when slider img is active in slick carousel when arrows are clicked(uses AsNavFor & vertical swiping))

Question

image for reference

1. As I'm using the AsNavFor and vertical slider together in slick carousel, the active slider gets the purple border,the bordered active slider is always on top by default, how to navigate via arrows so that bordered active slider is also navigating on 3 and 4th images.
2. if list of images is infinite how will it scroll along with showing active border when scrolled