Temporary background color change, how ?

Hello,

I remember some old versions of the wordpress administration pages would contain that graphical effect, and I didn’t see any place where the way to do it is explained… I’m asking it here just in case…

Sometimes, in the old wordpress admin, after you made a change, there would be a text with a yellow background color, and for a few seconds, no need to hover your mouse pointer above it, the background color for that text line would softly change to another color.
That is a cute, unobstrusive and efficient attention catcher.

Would you know how to achieve that again ?
I would need to do that, but I don’t manage to find an actual example or a place from which i could copy the source code for this, neither did I find results with a google search…

Thanks a lot if you can help 🙂