Help! Simple In-Post search function wanted. Like CTRL F

Hello there,

I have a site with just one post. Albeit, a long one. I want to add a search function on that page/post only, like a CTRL+F that searches within the page and highlights results etc.

Anyone know the best way of achieving this? I tried using a plugin called Relevanssi to make the native WP search better, which kind of works regarding highlighting etc, but it still brings up the search results as a ‘what post the results are in’ context, so that when you click on it you’re just taken to the long post and all the highlighted search results are lost. Hope that makes sense. If I could just add the search function to the one page/post and not have it search the whole site, that would be great.

Any ideas?