How do I superscript ® symbol globally across a site?

Site URL: https://www.swoopanalytics.com/

I am trying to change all ® symbols across my site to superscript. There are too many to manually change all of the text blocks to code/markdown blocks so I'm looking for a javascript or CSS solution. Any suggestions would be very much appreciated!

The only way is use script code. 

I remember you used to add a script code then remove it. Can you send it?

Yes, it was causing some images on the pages to disappear... Here's the code:

<script>
  /* superscripting all ® which aren't already */
window.addEventListener("DOMContentLoaded", function(){
    document.querySelectorAll("p, a, h1, h2, h3, h4, h5, h6, label").forEach(function (el) {
        el.innerHTML = el.innerHTML.replace(/®(?!\<\/sup)/g, "^®");
    })
});
</script>