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Overflow hidden scroll problem in firefox

Hi all,
I am facing a problem in firefox. I made an image slider with vertical flex in overflow hidden grid element. It’s working fine in chrome and edge, but in firefox, it is getting minimised to fit into the parent element. I would appreciate if anyone can help me out with this.

I am attaching the screenshots for firefox and chrome respectively.

Here is my site Read-Only: [LINK][1]