Why more than 3 swiper slides?

Question

css

It is necessary so that there are 3 slides with text and instead of 3 more will be shown, I did everything like on the docks, but in fact it doesn’t work, I’ve been sitting for 2 hours rechecking the codepen

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Answer 1

Do you have a slider in each slide?
upd
Corrected your example

You don't need to do any slider layout inside swiper-slide. If you are making a vertical slider, then you need to limit the height of the slider. height: 100% is not appropriate if the parent element is unconstrained.