white band appears when expanding a section

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Hello :slight_smile:

I made a one page website with a few expandable sections.
When expanding a section, a white band appears at the bottom of all background pictures with parallax.

Here is an example before expanding:

Here is after expanding (clicking “read more”):

As you can see, a white band appears below the yellow background, and the same is for all background with parallax effect below.

Thank you very much in advance for any suggestion!

Lorenzo