Monochrome palette
Sumac Crossing
From #00406b ink through #0068a8, #2e83c5, #4f92cb to #6bafe9 light, Sumac Crossing is a analogous progression that holds together at any size. Use it for book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
skymonochromefive-stophigh-contrast
#00406b
#0068a8
#2e83c5
#4f92cb
#6bafe9
The generator opens with #00406b as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.