Why are the slides half visible when only one (slick slider) should be visible?

Question

css

Why are the passes not according to Feng Shui, half visible, but it must be, I want to see one picture, but I see two and half Sandbox

Answer 1

You have pictures of different sizes, because of this, the height of each slide is different. The slick slider doesn't seem to like it.
https://codepen.io/anon/pen/KLvijw