#1B277C#1B277C

#1B277C is a dark, vivid blue. Relative luminance 0.031; OKLCH L 32.6% C 0.143 H 269.9°. Best body text is #FFFFFF at 12.90:1 contrast (WCAG AA passes).

Color values

HEX	#1B277C
RGB	rgb(27, 39, 124)
HSL	hsl(233, 64%, 30%)
HSV	hsv(233, 78%, 49%)
CMYK	cmyk(78.2%, 68.5%, 0%, 51.4%)
CIE-LAB	lab(20.59, 27.28, -49.49)
CIE-LCH	lch(20.59, 56.51, 298.87°)
OKLab	oklab(32.64% -0.0003 -0.1432)
OKLCH	oklch(32.64% 0.143 269.9)
XYZ	xyz(4.8144, 3.1388, 19.4170)
Luminance	0.0314 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B277C #7C701B

analogous

#1B587C #1B277C #3F1B7C

triadic

#1B277C #7C1B27 #277C1B

tetradic

#1B277C #7C1B58 #7C701B #1B7C3F

square

#1B277C #7C1B58 #7C701B #1B7C3F

split-complementary

#1B277C #7C3F1B #587C1B

monochromatic

#050819 #10174A #1B277C #2637AE #3D50D5

Accessibility & contrast

On white

12.90

#1B277C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.63

#1B277C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B277C

12.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B277C	#FFFFFF	#000000	##FFFFFF
##1B277C	1.00	12.90	1.63	12.90
#FFFFFF	12.90	1.00	21.00	1.00
#000000	1.63	21.00	1.00	21.00
##FFFFFF	12.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00367F

Deuteranopia (green-blind)

#002D7A

Tritanopia (blue-blind)

#003E4E

Achromatopsia (no color)

#323232

Design tokens & code

CSS

--color: #1b277c;
/* rgb */ color: rgb(27, 39, 124);
/* oklch */ color: oklch(32.6% 0.143 269.9);

Tailwind

colors: {
  custom: {
    50: '#6861a3',
    500: '#1b277c',
    950: '#000000',
  },
}

SCSS

$custom: #1b277c;
$custom-light: #6861a3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b277c",
  "rgb": {
    "r": 27,
    "g": 39,
    "b": 124
  },
  "hsl": {
    "h": 232.577,
    "s": 64.238,
    "l": 29.608
  },
  "oklch": {
    "l": 0.32637,
    "c": 0.14316,
    "h": 269.9
  },
  "luminance": 0.03139
}

Semantic roles & 50–950 ramp

primary

#1B277C

secondary

#B0A243

accent

#D341E7

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1B277C

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

Preview Lab → · Contrast checker → · Palette generator →