Nautical palette
Fiery Reef
From #004a51 ink through #007580, #31909b, #549ea7 to #70bac3 light, Fiery Reef 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.
cyannauticalfive-stophigh-contrast
#004a51
#007580
#31909b
#549ea7
#70bac3
The generator opens with #004a51 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.