#042539#042539

#042539 is a dark, muted cyan. Relative luminance 0.016; OKLCH L 25.3% C 0.053 H 240.2°. Best body text is #FFFFFF at 15.80:1 contrast (WCAG AA passes).

Color values

HEX	#042539
RGB	rgb(4, 37, 57)
HSL	hsl(203, 87%, 12%)
HSV	hsv(203, 93%, 22%)
CMYK	cmyk(93%, 35.1%, 0%, 77.6%)
CIE-LAB	lab(13.50, -3.14, -16.24)
CIE-LCH	lch(13.50, 16.54, 259.06°)
OKLab	oklab(25.26% -0.0264 -0.046)
OKLCH	oklch(25.26% 0.053 240.2)
XYZ	xyz(1.4499, 1.6442, 4.1110)
Luminance	0.0164 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#042539 #391804

analogous

#043933 #042539 #040A39

triadic

#042539 #390425 #253904

tetradic

#042539 #330439 #391804 #0A3904

square

#042539 #330439 #391804 #0A3904

split-complementary

#042539 #39040A #393304

monochromatic

#02131D #02131D #042539 #084A72 #0C6FAB

Accessibility & contrast

On white

15.80

#042539 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.33

#042539 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #042539

15.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##042539	#FFFFFF	#000000	##FFFFFF
##042539	1.00	15.80	1.33	15.80
#FFFFFF	15.80	1.00	21.00	1.00
#000000	1.33	21.00	1.00	21.00
##FFFFFF	15.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B253A

Deuteranopia (green-blind)

#142039

Tritanopia (blue-blind)

#002A2C

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #042539;
/* rgb */ color: rgb(4, 37, 57);
/* oklch */ color: oklch(25.3% 0.053 240.2);

Tailwind

colors: {
  custom: {
    50: '#4e5f6f',
    500: '#042539',
    950: '#000000',
  },
}

SCSS

$custom: #042539;
$custom-light: #4e5f6f;
$custom-dark: #000000;

JSON

{
  "hex": "#042539",
  "rgb": {
    "r": 4,
    "g": 37,
    "b": 57
  },
  "hsl": {
    "h": 202.642,
    "s": 86.885,
    "l": 11.961
  },
  "oklch": {
    "l": 0.25263,
    "c": 0.05306,
    "h": 240.2
  },
  "luminance": 0.01644
}

Semantic roles & 50–950 ramp

primary

#042539

secondary

#7B411E

accent

#7A2BFD

background

#F4F5F6

surface

#E7E9EC

border

#C3C5C7

text

#020407

muted

#78797A

Preview Lab

Preview with #042539

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

Preview Lab → · Contrast checker → · Palette generator →