Why doesn't slick-slider work on initial settings?

Question

Slick

In general, no slider works in codepen
Here is an example: https://codepen.io/topicstarter/pen/dgjebV
Link to jquery from cdnjs.com
Link to slick.slider.min.js also from
sdnjs.com written off site:

$(имя класса).slick({
   autoplay:true 
 });

buttons and slides appear somewhere it is not at all clear where ...
what is happening?

Answer 1

buttons and slides somewhere it’s not at all clear where

css forgot to include