Monochrome palette
Quilted Delta
From #004474 ink through #006cb2, #2f88d0, #5197d5 to #6db3f3 light, Quilted Delta is a complementary 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
#004474
#006cb2
#2f88d0
#5197d5
#6db3f3
The generator opens with #004474 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.