I would use a strip of WS2812b LEDs. There are lots of tutorials for using these. They are also known as Neopixels when sold by Adafruit.
Anything else is making a mountain of work for yourself.
Please post pictures correctly for this site, we don't like going off site for images image guide
We do not like cross posts here DO NOT DO IT
I have reported your other post and I expect it will be deleted. While you are at it please read this:-
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