#183A78#183A78

#183A78 is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.2% C 0.113 H 261.2°. Best body text is #FFFFFF at 10.96:1 contrast (WCAG AA passes).

Color values

HEX	#183A78
RGB	rgb(24, 58, 120)
HSL	hsl(219, 67%, 28%)
HSV	hsv(219, 80%, 47%)
CMYK	cmyk(80%, 51.7%, 0%, 52.9%)
CIE-LAB	lab(25.49, 11.93, -38.98)
CIE-LCH	lch(25.49, 40.76, 287.01°)
OKLab	oklab(36.16% -0.0174 -0.1121)
OKLCH	oklch(36.16% 0.113 261.2)
XYZ	xyz(5.2787, 4.5758, 18.3707)
Luminance	0.0458 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A78 #785618

analogous

#186A78 #183A78 #261878

triadic

#183A78 #78183A #3A7818

tetradic

#183A78 #78186A #785618 #187826

square

#183A78 #78186A #785618 #187826

split-complementary

#183A78 #782618 #6A7818

monochromatic

#050C1A #0E2145 #183A78 #2253AB #346ED6

Accessibility & contrast

On white

10.96

#183A78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#183A78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A78

10.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A78	#FFFFFF	#000000	##FFFFFF
##183A78	1.00	10.96	1.92	10.96
#FFFFFF	10.96	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#15417A

Deuteranopia (green-blind)

#003877

Tritanopia (blue-blind)

#004953

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183a78;
/* rgb */ color: rgb(24, 58, 120);
/* oklch */ color: oklch(36.2% 0.113 261.2);

Tailwind

colors: {
  custom: {
    50: '#656f9f',
    500: '#183a78',
    950: '#000000',
  },
}

SCSS

$custom: #183a78;
$custom-light: #656f9f;
$custom-dark: #000000;

JSON

{
  "hex": "#183a78",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 120
  },
  "hsl": {
    "h": 218.75,
    "s": 66.667,
    "l": 28.235
  },
  "oklch": {
    "l": 0.36163,
    "c": 0.11342,
    "h": 261.2
  },
  "luminance": 0.04576
}

Semantic roles & 50–950 ramp

primary

#183A78

secondary

#AD863F

accent

#AD3EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183A78

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

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