Download List JS from the website, save it as a txt file, and then upload the file into your assets panel. Reference that file in the custom code box for your site or page.
Add in your Collection List, and then add in all of your content. Style it for all breakpoints, and make sure you use simple class names for the elements you want to filter.
Make sure the list is wrapped in a div and that you set the ID. Make sure and include your input and search element and add the variables at the bottom. See the page above for examples.
Publish your page and start searching and filtering. Come up with amazing ways to implement it in to all of your cool Webflow projects! :)