#2540A8#2540A8

#2540A8 is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.1% C 0.170 H 267.2°. Best body text is #FFFFFF at 8.83:1 contrast (WCAG AA passes).

Color values

HEX	#2540A8
RGB	rgb(37, 64, 168)
HSL	hsl(228, 64%, 40%)
HSV	hsv(228, 78%, 66%)
CMYK	cmyk(78%, 61.9%, 0%, 34.1%)
CIE-LAB	lab(31.55, 28.41, -58.66)
CIE-LCH	lch(31.55, 65.18, 295.84°)
OKLab	oklab(42.08% -0.0082 -0.1696)
OKLCH	oklch(42.08% 0.17 267.2)
XYZ	xyz(9.6618, 6.8862, 37.8582)
Luminance	0.0689 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2540A8 #A88D25

analogous

#2581A8 #2540A8 #4C25A8

triadic

#2540A8 #A82540 #40A825

tetradic

#2540A8 #A82581 #A88D25 #25A84C

square

#2540A8 #A82581 #A88D25 #25A84C

split-complementary

#2540A8 #A84C25 #81A825

monochromatic

#0F1A44 #1A2D76 #2540A8 #3757D3 #6981DE

Accessibility & contrast

On white

8.83

#2540A8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.38

#2540A8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2540A8

8.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2540A8	#FFFFFF	#000000	##FFFFFF
##2540A8	1.00	8.83	2.38	8.83
#FFFFFF	8.83	1.00	21.00	1.00
#000000	2.38	21.00	1.00	21.00
##FFFFFF	8.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051AB

Deuteranopia (green-blind)

#0044A6

Tritanopia (blue-blind)

#005B6E

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #2540a8;
/* rgb */ color: rgb(37, 64, 168);
/* oklch */ color: oklch(42.1% 0.170 267.2);

Tailwind

colors: {
  custom: {
    50: '#7574c3',
    500: '#2540a8',
    950: '#000000',
  },
}

SCSS

$custom: #2540a8;
$custom-light: #7574c3;
$custom-dark: #000000;

JSON

{
  "hex": "#2540a8",
  "rgb": {
    "r": 37,
    "g": 64,
    "b": 168
  },
  "hsl": {
    "h": 227.634,
    "s": 63.902,
    "l": 40.196
  },
  "oklch": {
    "l": 0.42076,
    "c": 0.16978,
    "h": 267.2
  },
  "luminance": 0.06887
}

Semantic roles & 50–950 ramp

primary

#2540A8

secondary

#C4B065

accent

#C541E7

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #2540A8

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

Preview Lab → · Contrast checker → · Palette generator →