Modify WS2812b color on custom library

Hello All

Currently I working on custom digital led clock using ws2812b led.
And I am using this seven segment pixel library and it’s worked.
However I want to make the static color have some effect such color fade, breathe or rainbow led, but I can’t figure it out how to do it. Over a week search on Google, trial n error but still no success.

So any help or clue would be appreciated. I also included my sketch, please feel free to check.
Please don’t be so hard to me because I am kinda noob. :slight_smile:

Thanks in advance.

Clock.ino (4.12 KB)

Maybe you should have a look at this (Lightuino 5 library).

Thank you for the reply, :) will check the link right away.