How to make a selection in a slider?

Question

css

Hello, how can I make a frame (for example, blue) for the active (current) slider during autoplay? It doesn't work on its own. In manual mode, the frame is made, but I want the frame for the current slide to appear when autoplay is running (sorry for repeating. This is to make it clearer)
kenwheeler.github.io/slick - the
codepen.io/anon/pen/jPJwVV slider itself - here is the test

Answer 1

$('.your-element').on('beforeChange', function(event, slick, currentSlide, nextSlide){
  currentSlide.addClass('active');
});