#1B277D#1B277D

#1B277D is a dark, vivid blue. Relative luminance 0.032; OKLCH L 32.7% C 0.145 H 269.9°. Best body text is #FFFFFF at 12.86:1 contrast (WCAG AA passes).

Color values

HEX	#1B277D
RGB	rgb(27, 39, 125)
HSL	hsl(233, 64%, 30%)
HSV	hsv(233, 78%, 49%)
CMYK	cmyk(78.4%, 68.8%, 0%, 51%)
CIE-LAB	lab(20.69, 27.66, -49.96)
CIE-LCH	lch(20.69, 57.11, 298.97°)
OKLab	oklab(32.74% -0.0004 -0.1445)
OKLCH	oklch(32.74% 0.145 269.9)
XYZ	xyz(4.8779, 3.1642, 19.7517)
Luminance	0.0316 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B277D #7D711B

analogous

#1B587D #1B277D #401B7D

triadic

#1B277D #7D1B27 #277D1B

tetradic

#1B277D #7D1B58 #7D711B #1B7D40

square

#1B277D #7D1B58 #7D711B #1B7D40

split-complementary

#1B277D #7D401B #587D1B

monochromatic

#050819 #10174B #1B277D #2637AF #3D50D5

Accessibility & contrast

On white

12.86

#1B277D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.63

#1B277D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B277D

12.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B277D	#FFFFFF	#000000	##FFFFFF
##1B277D	1.00	12.86	1.63	12.86
#FFFFFF	12.86	1.00	21.00	1.00
#000000	1.63	21.00	1.00	21.00
##FFFFFF	12.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003780

Deuteranopia (green-blind)

#002D7B

Tritanopia (blue-blind)

#003E4E

Achromatopsia (no color)

#323232

Design tokens & code

CSS

--color: #1b277d;
/* rgb */ color: rgb(27, 39, 125);
/* oklch */ color: oklch(32.7% 0.145 269.9);

Tailwind

colors: {
  custom: {
    50: '#6961a4',
    500: '#1b277d',
    950: '#000000',
  },
}

SCSS

$custom: #1b277d;
$custom-light: #6961a4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b277d",
  "rgb": {
    "r": 27,
    "g": 39,
    "b": 125
  },
  "hsl": {
    "h": 232.653,
    "s": 64.474,
    "l": 29.804
  },
  "oklch": {
    "l": 0.32739,
    "c": 0.14454,
    "h": 269.9
  },
  "luminance": 0.03165
}

Semantic roles & 50–950 ramp

primary

#1B277D

secondary

#B1A343

accent

#D340E7

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1B277D

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

Preview Lab → · Contrast checker → · Palette generator →