XF 1.5 Looking for CSS Code to do this

So if you've ever played call of duty world at war then you will know exactly what i am on about straight away!

Im looking for a CSS code that allows me to put a name flasher on as a custom rank!
i have one now that is rainbow effect but it doesnt move / or change.

Im looking for one where it cycles through the colors of my choice, if you could maybe let me know then i would be more than greatful!
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