Board Thread:Support Requests - Designing Your Wiki/@comment-31276567-20170925222531/@comment-168424-20170925231219

See CSS3 Animations at W3Schools to start with.

You can test the CSS at Special:MyPage/wikia.css on the wiki where you want it to work.

If you see some examples on other wikis, give us the link and we can help you dissect how they did it.