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Modal - Background body scrolling issues

Hi there,
having a few scrolling background issue when modal is opened. So I did try inserting a custom code to fix this scrolling problem, but the background starts scrolling again when I click a part of the screen when modal is open. Also seems like the code didn’t work in tablet and mobile settings?
Anyone know what the issues might be?
I have attached an image of custom codes that I tried using for you to look at

Thank you!

Here is my site Read-Only: [LINK][1]