Aurora palette
Vintage Outpost
From #2e6b91 ink through #007280, #127566, #308d9b to #389080 light, Vintage Outpost is a tetradic progression that holds together at any size. Use it for book covers that read at thumbnail size.
skyaurorafive-stop
#2e6b91
#007280
#127566
#308d9b
#389080
The generator opens with #2e6b91 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.