Tropical palette
Torrid Alley
From #004f52 ink through #007b7f, #33969a, #56a4a7 to #73c0c3 light, Torrid Alley 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 for large text.
cyantropicalfive-stop
#004f52
#007b7f
#33969a
#56a4a7
#73c0c3
The generator opens with #004f52 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.