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Search Pop Up Like This Forum

I’m working on a site and want to add a search icon link in the main navigation that appears on all pages and pops up the search entry and execute button - just like this forum and I have added another example I found (not webflow) and if possible work on mobile view. I found something very similar on the form too but would appreciate advice on accomplishing on my site.

similar forum: Search Popup on every page of the site

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