#183A51#183A51

#183A51 is a dark, muted cyan. Relative luminance 0.038; OKLCH L 33.5% C 0.057 H 240.9°. Best body text is #FFFFFF at 11.91:1 contrast (WCAG AA passes).

Color values

HEX	#183A51
RGB	rgb(24, 58, 81)
HSL	hsl(204, 54%, 21%)
HSV	hsv(204, 70%, 32%)
CMYK	cmyk(70.4%, 28.4%, 0%, 68.2%)
CIE-LAB	lab(23.05, -3.97, -17.62)
CIE-LCH	lch(23.05, 18.06, 257.29°)
OKLab	oklab(33.47% -0.0275 -0.0496)
OKLCH	oklch(33.47% 0.057 240.9)
XYZ	xyz(3.3744, 3.8140, 8.3413)
Luminance	0.0381 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A51 #512F18

analogous

#18514B #183A51 #181D51

triadic

#183A51 #51183A #3A5118

tetradic

#183A51 #4B1851 #512F18 #1D5118

square

#183A51 #4B1851 #512F18 #1D5118

split-complementary

#183A51 #51181D #514B18

monochromatic

#071118 #0A1822 #183A51 #265C80 #347EAF

Accessibility & contrast

On white

11.91

#183A51 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.76

#183A51 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A51

11.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A51	#FFFFFF	#000000	##FFFFFF
##183A51	1.00	11.91	1.76	11.91
#FFFFFF	11.91	1.00	21.00	1.00
#000000	1.76	21.00	1.00	21.00
##FFFFFF	11.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#303A52

Deuteranopia (green-blind)

#283451

Tritanopia (blue-blind)

#004042

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #183a51;
/* rgb */ color: rgb(24, 58, 81);
/* oklch */ color: oklch(33.5% 0.057 240.9);

Tailwind

colors: {
  custom: {
    50: '#5c7082',
    500: '#183a51',
    950: '#000000',
  },
}

SCSS

$custom: #183a51;
$custom-light: #5c7082;
$custom-dark: #000000;

JSON

{
  "hex": "#183a51",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 81
  },
  "hsl": {
    "h": 204.211,
    "s": 54.286,
    "l": 20.588
  },
  "oklch": {
    "l": 0.3347,
    "c": 0.0567,
    "h": 240.9
  },
  "luminance": 0.03814
}

Semantic roles & 50–950 ramp

primary

#183A51

secondary

#885B3D

accent

#864ADE

background

#F5F6F7

surface

#E9ECEE

border

#C5C7C9

text

#04070A

muted

#797A7C

Preview Lab

Preview with #183A51

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

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