Background color bug in Safari

I’m not sure if it’s a bug or my own inexperience, but there is a problem that occurs only in Safari. On the home page, the section that comes after the slider, which scrolls above the slider, sometimes has a transparent background, and sometimes has a dark fill. It’s set to have a dark fill so it makes no sense why it goes transparent. It seems to happen randomly.

Does anyone have any ideas?

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