when people click the "Click/tap here to copy code" on the site it doesn't actually copy the code

I made this site the other day - https://trx.promo/ and the issue i am having is when people click the "Click/tap here to copy code" on the site it doesn't actually copy the code and yes i added it all right to the html file... ofcourse unless you can find a mistake in the page source code. I am using a built in website builder on a site called hostinger.com which is "Zyro website builder" incase someone asks. Anyways if someone can help me with a solution that would be great as i have been spending way to much time trying to find a solution.