Why did the styles go wrong?

Question

css

Hello!
I'm learning so sorry for the possibly stupid questions.
When connecting slick slider, my layout went down.
It should be like this

Without a slider, everything is fine - prntscr.com/ft63oa
With a slider - https://codepen.io/Slasher_/pen/pwxgEG?editors=1100
Please help.

Answer 1