How to make a color theme on cass?

Question

Sass

Hello. Please tell me how to implement a color theme on the site?
As far as I understand, I create variables in sass with colors, I switch js on button click. But what's next? How will this happen when the compressed css flies to the prod?

Answer 1

https://css-tricks.com/css-custom-properties-theming/
https://itnext.io/theming-with-css-custom-properti...
https://habr.com/en/post/ 496768/