I need a guy to create a custom search box in a website.

Hello,

Here is the website, https://5sim.net/ , I need someone to create a custom search box. This search box should find the word inside the iframe in the above website. Regular Ctrl + F won't work. I attached the iframe screenshot.

In detail, open the website, in left panel, select the "Country" first, you can select any country, then under the heading "2.Select Service", click the link "Show all Xxx". Now you can see a lot of services inside the iframe. If you use Ctrl + F, it wont find a word inside the iframe(Service), So I want to create a custom search box.

If you create an extension, it should work on Edge, Chrome and Firefox