#1B377E#1B377E

#1B377E is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.1% C 0.125 H 264.6°. Best body text is #FFFFFF at 11.09:1 contrast (WCAG AA passes).

Color values

HEX	#1B377E
RGB	rgb(27, 55, 126)
HSL	hsl(223, 65%, 30%)
HSV	hsv(223, 79%, 49%)
CMYK	cmyk(78.6%, 56.3%, 0%, 50.6%)
CIE-LAB	lab(25.17, 16.90, -43.28)
CIE-LCH	lch(25.17, 46.46, 291.33°)
OKLab	oklab(36.1% -0.0118 -0.1247)
OKLCH	oklch(36.1% 0.125 264.6)
XYZ	xyz(5.5827, 4.4711, 20.3034)
Luminance	0.0447 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B377E #7E621B

analogous

#1B697E #1B377E #301B7E

triadic

#1B377E #7E1B37 #377E1B

tetradic

#1B377E #7E1B69 #7E621B #1B7E30

square

#1B377E #7E1B69 #7E621B #1B7E30

split-complementary

#1B377E #7E301B #697E1B

monochromatic

#050B19 #10214C #1B377E #264DB0 #3E69D6

Accessibility & contrast

On white

11.09

#1B377E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1B377E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B377E

11.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B377E	#FFFFFF	#000000	##FFFFFF
##1B377E	1.00	11.09	1.89	11.09
#FFFFFF	11.09	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004080

Deuteranopia (green-blind)

#00377D

Tritanopia (blue-blind)

#004855

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b377e;
/* rgb */ color: rgb(27, 55, 126);
/* oklch */ color: oklch(36.1% 0.125 264.6);

Tailwind

colors: {
  custom: {
    50: '#676da4',
    500: '#1b377e',
    950: '#000000',
  },
}

SCSS

$custom: #1b377e;
$custom-light: #676da4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b377e",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 126
  },
  "hsl": {
    "h": 223.03,
    "s": 64.706,
    "l": 30
  },
  "oklch": {
    "l": 0.36099,
    "c": 0.12529,
    "h": 264.6
  },
  "luminance": 0.04472
}

Semantic roles & 50–950 ramp

primary

#1B377E

secondary

#B29243

accent

#B840E8

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B377E

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

Preview Lab → · Contrast checker → · Palette generator →