I have 4 blocks that have hover effect on desktop. But they should change their css when it's in visible zone themselves (in focus) on mobile. How can i do it? Help please, cannot find the solution.
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                    Possible duplicate of [How to Check if element is visible after scrolling?](https://stackoverflow.com/questions/487073/how-to-check-if-element-is-visible-after-scrolling) – cssBlaster21895 Jun 05 '19 at 21:28
