Monochrome palette
Kelp Harbor
From #00484c ink through #007379, #308e94, #539ba0 to #6fb8bc light, Kelp Harbor 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
#00484c
#007379
#308e94
#539ba0
#6fb8bc
The generator opens with #00484c as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.