Rich Cobalt Marble

#1a21a2

Notes

Rich Cobalt Marble (#1A21A2) is a true 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 (237°, 72%, 37%) places it in the balanced band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. 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

#1a21a2

RGB

rgb(26, 33, 162)

HSL

hsl(237, 72%, 37%)