Change buttons scrolling Owl Carousel from the status scroll?

Good time of day!
Faced with such a problem.
You need to make sure that izmenilsja color button Skoll depending on the condition of the scroll.
For example, if we initial best personal Finance: button left gray arrow, right arrow and the active color is black. If we scroll tip - arrow-right grey, and the active left(color black).
Thank you!
var owl=$(".product-slider");
 items : 4,
 nav: true,
 navText: ["<span class="\"icon-angle-left\""></span>","<span class="\"icon-angle-right\""></span>"]
June 27th 19 at 15:01

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