Board Thread:Support Requests - Designing Your Wiki/@comment-44745594-20200424221110

I've seen this script being used on other wikis such as:
 * Jak and Daxter Wiki
 * Riordan Wiki
 * Backyard Monsters Wiki

But when I try reading their CSS its really complicated and I don't really understand it. Fandom Developers Wiki say that this script is unstable but it looks fine on these wikis. Can someone please help explain to me the necessary codes and their meanings? Thx so much! 