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Prevent body scroll opening when menu opens

Hi all,

I have been attempting to solve this problem that is happening within my portfolio website.
I am attempting to use the same menu button that you see on the home page of my portfolio as the nav menu and want this to take up the entire width of the screen, however what I want is for the body to not scroll in the background. I have looked on the webflow forums for the code required for and have done it correctly but it suddenly stopped working after tweaking with the margin of one of the elements on my website. Really at a dud here and have no clue of how to go about this.