Deep Aqua Marble

#51cbdb

Notes

Deep Aqua Marble (#51CBDB) is a true cyan with a vibrant character. It holds its own as a focal accent, carrying visual weight without tipping into neon territory. Its HSL profile (187°, 66%, 59%) 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 red. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX

#51cbdb

RGB

rgb(81, 203, 219)

HSL

hsl(187, 66%, 59%)