#040A21#040A21

#040A21 is a very dark, muted blue. Relative luminance 0.004; OKLCH L 15.5% C 0.050 H 266.7°. Best body text is #FFFFFF at 19.62:1 contrast (WCAG AA passes).

Color values

HEX	#040A21
RGB	rgb(4, 10, 33)
HSL	hsl(228, 78%, 7%)
HSV	hsv(228, 88%, 13%)
CMYK	cmyk(87.9%, 69.7%, 0%, 87.1%)
CIE-LAB	lab(3.19, 4.00, -14.69)
CIE-LCH	lch(3.19, 15.23, 285.25°)
OKLab	oklab(15.47% -0.0029 -0.0498)
OKLCH	oklch(15.47% 0.05 266.7)
XYZ	xyz(0.4330, 0.3527, 1.4838)
Luminance	0.0035 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A21 #211B04

analogous

#041921 #040A21 #0D0421

triadic

#040A21 #21040A #0A2104

tetradic

#040A21 #210419 #211B04 #04210D

square

#040A21 #210419 #211B04 #04210D

split-complementary

#040A21 #210D04 #192104

monochromatic

#03081B #03081B #040A21 #0B1B58 #112B8E

Accessibility & contrast

On white

19.62

#040A21 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.07

#040A21 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A21

19.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A21	#FFFFFF	#000000	##FFFFFF
##040A21	1.00	19.62	1.07	19.62
#FFFFFF	19.62	1.00	21.00	1.00
#000000	1.07	21.00	1.00	21.00
##FFFFFF	19.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#010D22

Deuteranopia (green-blind)

#000A21

Tritanopia (blue-blind)

#000F13

Achromatopsia (no color)

#0C0C0C

Design tokens & code

CSS

--color: #040a21;
/* rgb */ color: rgb(4, 10, 33);
/* oklch */ color: oklch(15.5% 0.050 266.7);

Tailwind

colors: {
  custom: {
    50: '#484b5c',
    500: '#040a21',
    950: '#000000',
  },
}

SCSS

$custom: #040a21;
$custom-light: #484b5c;
$custom-dark: #000000;

JSON

{
  "hex": "#040a21",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 33
  },
  "hsl": {
    "h": 227.586,
    "s": 78.378,
    "l": 7.255
  },
  "oklch": {
    "l": 0.15468,
    "c": 0.0499,
    "h": 266.7
  },
  "luminance": 0.00353
}

Semantic roles & 50–950 ramp

primary

#040A21

secondary

#64551D

accent

#CD33F5

background

#F4F4F5

surface

#E6E7E9

border

#C2C3C5

text

#000104

muted

#777779

Preview Lab

Preview with #040A21

Body copy rendered with the generated semantic roles for this colour.

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