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Slider, unable to set up adaptive height to Flex/Height on Slider

I have various sliders on mobile device, I must get HEIGHT to dynamically change form 20em-35em range (auto size based on slide) so it doesnt crop content.

For example:
Slide 1. 20emH
Slide 2. 35emH

If I set fixed height to 35emH, the margines are terible against the 20emH slide
If I set height to 20emH, Slide 1 looks good, but Slide 2 is clipped off.