Blue Hour palette
Cobalt Hollow
From #00506c ink through #007aa3, #3396c0, #57a4c8 to #74c0e6 light, Cobalt Hollow is a analogous 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 for large text.
cyanbluehourfive-stop
#00506c
#007aa3
#3396c0
#57a4c8
#74c0e6
The generator opens with #00506c as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.