#2540B2#2540B2

#2540B2 is a dark, vivid blue. Relative luminance 0.073; OKLCH L 43.0% C 0.183 H 267.4°. Best body text is #FFFFFF at 8.55:1 contrast (WCAG AA passes).

Color values

HEX	#2540B2
RGB	rgb(37, 64, 178)
HSL	hsl(229, 66%, 42%)
HSV	hsv(229, 79%, 70%)
CMYK	cmyk(79.2%, 64%, 0%, 30.2%)
CIE-LAB	lab(32.42, 32.18, -63.20)
CIE-LCH	lch(32.42, 70.92, 296.99°)
OKLab	oklab(42.99% -0.0083 -0.1829)
OKLCH	oklch(42.99% 0.183 267.4)
XYZ	xyz(10.6294, 7.2732, 42.9545)
Luminance	0.0727 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2540B2 #B29725

analogous

#2586B2 #2540B2 #5125B2

triadic

#2540B2 #B22540 #40B225

tetradic

#2540B2 #B22586 #B29725 #25B251

square

#2540B2 #B22586 #B29725 #25B251

split-complementary

#2540B2 #B25125 #86B225

monochromatic

#101C4D #1A2E7F #2540B2 #3D5BD7 #7086E1

Accessibility & contrast

On white

8.55

#2540B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#2540B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2540B2

8.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2540B2	#FFFFFF	#000000	##FFFFFF
##2540B2	1.00	8.55	2.45	8.55
#FFFFFF	8.55	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B6

Deuteranopia (green-blind)

#0046B0

Tritanopia (blue-blind)

#005E73

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #2540b2;
/* rgb */ color: rgb(37, 64, 178);
/* oklch */ color: oklch(43.0% 0.183 267.4);

Tailwind

colors: {
  custom: {
    50: '#7774ca',
    500: '#2540b2',
    950: '#000000',
  },
}

SCSS

$custom: #2540b2;
$custom-light: #7774ca;
$custom-dark: #000000;

JSON

{
  "hex": "#2540b2",
  "rgb": {
    "r": 37,
    "g": 64,
    "b": 178
  },
  "hsl": {
    "h": 228.511,
    "s": 65.581,
    "l": 42.157
  },
  "oklch": {
    "l": 0.42992,
    "c": 0.18307,
    "h": 267.4
  },
  "luminance": 0.07274
}

Semantic roles & 50–950 ramp

primary

#2540B2

secondary

#C8B66B

accent

#C83FE9

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #2540B2

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

Preview Lab → · Contrast checker → · Palette generator →