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Right arrow (slide) just disappears (on chrome android)

My site has a slide with right-arrow. I customize a little bit and everything is ok on mobile version (chrome desktop). But the right-arrow disappear on mobile (chrome android). Would anyone give me some advise?
Thank you.

Here is my site Read-Only:

What version chrome / android?
V70+ supports css-grid. Before that I don’t think so. Your using CSS Grid in your slides.