Nebula palette
Birch Mesa
From #203f82 ink through #4768ab, #6083c8, #7493cf to #8fafed light, Birch Mesa 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.
skynebulafive-stophigh-contrast
#203f82
#4768ab
#6083c8
#7493cf
#8fafed
The generator opens with #203f82 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.