#183F51#183F51

#183F51 is a dark, muted cyan. Relative luminance 0.043; OKLCH L 34.8% C 0.054 H 231.1°. Best body text is #FFFFFF at 11.24:1 contrast (WCAG AA passes).

Color values

HEX	#183F51
RGB	rgb(24, 63, 81)
HSL	hsl(199, 54%, 21%)
HSV	hsv(199, 70%, 32%)
CMYK	cmyk(70.4%, 22.2%, 0%, 68.2%)
CIE-LAB	lab(24.77, -7.23, -14.94)
CIE-LCH	lch(24.77, 16.60, 244.16°)
OKLab	oklab(34.84% -0.0337 -0.0418)
OKLCH	oklch(34.84% 0.054 231.1)
XYZ	xyz(3.6388, 4.3429, 8.4295)
Luminance	0.0434 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F51 #512A18

analogous

#185146 #183F51 #182251

triadic

#183F51 #51183F #3F5118

tetradic

#183F51 #461851 #512A18 #225118

square

#183F51 #461851 #512A18 #225118

split-complementary

#183F51 #511822 #514618

monochromatic

#071218 #0A1A22 #183F51 #266480 #3488AF

Accessibility & contrast

On white

11.24

#183F51 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#183F51 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F51

11.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F51	#FFFFFF	#000000	##FFFFFF
##183F51	1.00	11.24	1.87	11.24
#FFFFFF	11.24	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#363E52

Deuteranopia (green-blind)

#2E3851

Tritanopia (blue-blind)

#004445

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183f51;
/* rgb */ color: rgb(24, 63, 81);
/* oklch */ color: oklch(34.8% 0.054 231.1);

Tailwind

colors: {
  custom: {
    50: '#5c7482',
    500: '#183f51',
    950: '#000000',
  },
}

SCSS

$custom: #183f51;
$custom-light: #5c7482;
$custom-dark: #000000;

JSON

{
  "hex": "#183f51",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 81
  },
  "hsl": {
    "h": 198.947,
    "s": 54.286,
    "l": 20.588
  },
  "oklch": {
    "l": 0.34842,
    "c": 0.05371,
    "h": 231.1
  },
  "luminance": 0.04343
}

Semantic roles & 50–950 ramp

primary

#183F51

secondary

#88553D

accent

#794ADE

background

#F5F7F7

surface

#E9EDEE

border

#C5C8C9

text

#04080A

muted

#797B7C

Preview Lab

Preview with #183F51

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

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