Just recently, I had a surprising discovery when I right-clicked on the cross icon and noticed that the background image in the Tags section of the Ask Question page contained multiple icons beyond just the cross. Curious about how this was achieved, I searched for information online and learned that it was done using a combination of HTML and CSS. Despite my efforts, the search results didn't provide the answers I was seeking.
As someone new to HTML, I stumbled upon the language of CSS during my search. While this question may seem simple to experts, it's proving to be quite a headache for beginners like myself. I would greatly appreciate any guidance on how this effect is achieved.
Thank you in advance for any help you can provide.