Dusky Cobalt Marble

#1b1b8d

Notes

Dusky Cobalt Marble (#1B1B8D) is a deep blue with a jewel character. It carries the deep, saturated richness of a gemstone. Authoritative and slightly formal, it works well for type and heavy UI elements. Its HSL profile (240°, 68%, 33%) places it in the balanced band at a dark lightness. It works well as a headline, icon, or deep background in an otherwise light layout, pairing cleanly with cream, bone, and warm neutrals. For a confident two-color system, pair it with its complementary yellow. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX

#1b1b8d

RGB

rgb(27, 27, 141)

HSL

hsl(240, 68%, 33%)