Note to self: OKLCH hues are roughly 29=red, 58=orange, 110=yellow, 144=green, 250=blue, 301=purple. For OKLCH, 0.96 Lgt and 0.018 Chr works well for black text background colors. Also 0.98 and 0.009, which gives red, orange, yellow, green, blue, purple. For light text, 0.4/0.068 gives a nice background: red, orange, yellow, green, blue, purple.