Odd CSS links

I ran Google's Lighthouse audit on my website a few times and occasionally it gives the suggestion to reduce unused CSS. When I expand this one of the things it showed was:

a[href^="http://www.easydownloadnow.com/"] { display: none !important; } ...

and in a separate audit it showed this:

a[href^="http://adultgames.xxx/"] { display: none !important; } ...

The only other plug-ins I have used were installed through Wordpress and were Imagify and WebP Converter for Media. Where did this CSS come from and how do I delete it?

Thanks!