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Change Text Color Based on Section

Hey awesome people,

I need your help to implement this idea.

I have a very long page and have different background color on some sections (e.g. 1st section is black, 2nd section is black, 3rd is white, and so on). Then, I have a fixed menu on the bottom right (attached). The idea is the text color should be changed when this menu reached on specific section/different background.

I can’t make this site public to share with you guys. So, I create a dummy case.