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

my site: https://preview.webflow.com/preview/nrcma?utm_medium=preview_link&utm_source=designer&utm_content=nrcma&preview=5f174dbb75b3e18e99556243d3208b4c&pageId=5dd4a95eb98acb715528fa9e&mode=preview


Here is my public share link: LINK
(how to access public share link)