Oh, the Hue Manatee!

Seems important:

Notes!

• That’s dumb we need vendor prefixes for masking still.
• vmin is nice for sizing things that will never be bigger than viewport in either direction.
• Feels like cheating when you only use one keyframe.
• I wanted to use OKLCH and keep it simple, so I found value for Chrome and Lightness that the Hue went straight through.