#040C21#040C21

#040C21 is a very dark, muted blue. Relative luminance 0.004; OKLCH L 16.0% C 0.047 H 263.5°. Best body text is #FFFFFF at 19.45:1 contrast (WCAG AA passes).

Color values

HEX	#040C21
RGB	rgb(4, 12, 33)
HSL	hsl(223, 78%, 7%)
HSV	hsv(223, 88%, 13%)
CMYK	cmyk(87.9%, 63.6%, 0%, 87.1%)
CIE-LAB	lab(3.60, 3.16, -14.06)
CIE-LCH	lch(3.60, 14.41, 282.68°)
OKLab	oklab(16.03% -0.0053 -0.0463)
OKLCH	oklch(16.03% 0.047 263.5)
XYZ	xyz(0.4560, 0.3985, 1.4914)
Luminance	0.0040 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040C21 #211904

analogous

#041B21 #040C21 #0B0421

triadic

#040C21 #21040C #0C2104

tetradic

#040C21 #21041B #211904 #04210B

square

#040C21 #21041B #211904 #04210B

split-complementary

#040C21 #210B04 #1B2104

monochromatic

#030A1B #030A1B #040C21 #0B2058 #11348E

Accessibility & contrast

On white

19.45

#040C21 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.08

#040C21 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040C21

19.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040C21	#FFFFFF	#000000	##FFFFFF
##040C21	1.00	19.45	1.08	19.45
#FFFFFF	19.45	1.00	21.00	1.00
#000000	1.08	21.00	1.00	21.00
##FFFFFF	19.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#030E22

Deuteranopia (green-blind)

#000C21

Tritanopia (blue-blind)

#001114

Achromatopsia (no color)

#0D0D0D

Design tokens & code

CSS

--color: #040c21;
/* rgb */ color: rgb(4, 12, 33);
/* oklch */ color: oklch(16.0% 0.047 263.5);

Tailwind

colors: {
  custom: {
    50: '#484c5c',
    500: '#040c21',
    950: '#000000',
  },
}

SCSS

$custom: #040c21;
$custom-light: #484c5c;
$custom-dark: #000000;

JSON

{
  "hex": "#040c21",
  "rgb": {
    "r": 4,
    "g": 12,
    "b": 33
  },
  "hsl": {
    "h": 223.448,
    "s": 78.378,
    "l": 7.255
  },
  "oklch": {
    "l": 0.16027,
    "c": 0.04659,
    "h": 263.5
  },
  "luminance": 0.00399
}

Semantic roles & 50–950 ramp

primary

#040C21

secondary

#64501D

accent

#BF33F5

background

#F4F4F5

surface

#E6E7E9

border

#C2C3C5

text

#000104

muted

#777779

Preview Lab

Preview with #040C21

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

Preview Lab → · Contrast checker → · Palette generator →