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Trouble with Memberstack Gated Content on website

The Stack Sats (
In the above link you can see a black background over the article.

The black back-ground is a full page fixed div whixh suppose to act as a lock for the content.
How do i disable the scroll function for the article behind the BG?

I’m using memberstack so i can show /hide the fixed div. I only wanted to know how to disable the scroll on the article if the fixed div is shows up.