You might already know this, but the original emoji is from Twemoji, CC BY 4.0. I am obliged to say that, legally, if you use one of these emoji, you should attribute them. Attributing me would be nice too, I guess. Bits of code and equations from Bruce Lindbloom, the CSS Color Module Level 4, css.land/lch by Lea Verou, etc.

This stuff probably only works on modern browsers.