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Background colour change

Hey there,

so I’m trying to use a rotational parallax effect in combination with a background color transition. I can’t work my head around how to make the rotational object dissappear while scrolling down to the next section. I’d like them to dissappear with the black background and smooth into white.

Below you can find my links. Thanks in advance. Much appreciated!

Here is my site Read-Only:

Live Link:

Is the background color change not working with grid?