Monochrome palette
Cobalt Canyon
From #004b50 ink through #00767e, #319199, #549ea5 to #71bbc1 light, Cobalt Canyon 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.
cyanmonochromefive-stophigh-contrast
#004b50
#00767e
#319199
#549ea5
#71bbc1
The generator opens with #004b50 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.