Blue Hour palette
Sienna Cellar
From #00448c ink through #076ad1, #3086f0, #5298f2 to #7eb5ff light, Sienna Cellar is a tetradic progression that holds together at any size. Use it for newsletters where the header, links, and footers share one voice. The darkest and lightest stops clear AA as a text pair.
skybluehourfive-stophigh-contrast
#00448c
#076ad1
#3086f0
#5298f2
#7eb5ff
The generator opens with #00448c as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.