Blue Hour palette
Sumac Mill
From #255d9c ink through #5287c6, #6da3e4, #85b3eb to #a8cfff light, Sumac Mill 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 for large text.
skybluehourfive-stop
#255d9c
#5287c6
#6da3e4
#85b3eb
#a8cfff
The generator opens with #255d9c as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.