#1F277B#1F277B

#1F277B is a dark, vivid blue. Relative luminance 0.032; OKLCH L 32.8% C 0.141 H 271.7°. Best body text is #FFFFFF at 12.85:1 contrast (WCAG AA passes).

Color values

HEX	#1F277B
RGB	rgb(31, 39, 123)
HSL	hsl(235, 60%, 30%)
HSV	hsv(235, 75%, 48%)
CMYK	cmyk(74.8%, 68.3%, 0%, 51.8%)
CIE-LAB	lab(20.72, 27.37, -48.63)
CIE-LCH	lch(20.72, 55.80, 299.37°)
OKLab	oklab(32.76% 0.0042 -0.1406)
OKLCH	oklch(32.76% 0.141 271.7)
XYZ	xyz(4.8645, 3.1719, 19.0909)
Luminance	0.0317 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F277B #7B731F

analogous

#1F557B #1F277B #451F7B

triadic

#1F277B #7B1F27 #277B1F

tetradic

#1F277B #7B1F55 #7B731F #1F7B45

square

#1F277B #7B1F55 #7B731F #1F7B45

split-complementary

#1F277B #7B451F #557B1F

monochromatic

#060819 #13184A #1F277B #2B36AC #4451D0

Accessibility & contrast

On white

12.85

#1F277B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.63

#1F277B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F277B

12.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F277B	#FFFFFF	#000000	##FFFFFF
##1F277B	1.00	12.85	1.63	12.85
#FFFFFF	12.85	1.00	21.00	1.00
#000000	1.63	21.00	1.00	21.00
##FFFFFF	12.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00367E

Deuteranopia (green-blind)

#002E79

Tritanopia (blue-blind)

#003D4D

Achromatopsia (no color)

#323232

Design tokens & code

CSS

--color: #1f277b;
/* rgb */ color: rgb(31, 39, 123);
/* oklch */ color: oklch(32.8% 0.141 271.7);

Tailwind

colors: {
  custom: {
    50: '#6a61a2',
    500: '#1f277b',
    950: '#000000',
  },
}

SCSS

$custom: #1f277b;
$custom-light: #6a61a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f277b",
  "rgb": {
    "r": 31,
    "g": 39,
    "b": 123
  },
  "hsl": {
    "h": 234.783,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.32762,
    "c": 0.14062,
    "h": 271.7
  },
  "luminance": 0.03172
}

Semantic roles & 50–950 ramp

primary

#1F277B

secondary

#AEA548

accent

#D545E3

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1F277B

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

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