Admin & Moderator Signature

Here on this board staff have a funky signature that say VANILLA and pops up when hovered over.
How do I go about implementing something like this on my forum does anyone know?
Thanks in advance
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The roletitle plugin adds class then use that to make new CSS rules for the .Message div
❌ ✊ ♥. ¸. ••. ¸♥¸. ••. ¸♥ ✊ ❌
Is there any CSS code you have to hand for such a thing by any chance?