#2540B4#2540B4

#2540B4 is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.2% C 0.186 H 267.4°. Best body text is #FFFFFF at 8.50:1 contrast (WCAG AA passes).

Color values

HEX	#2540B4
RGB	rgb(37, 64, 180)
HSL	hsl(229, 66%, 43%)
HSV	hsv(229, 79%, 71%)
CMYK	cmyk(79.4%, 64.4%, 0%, 29.4%)
CIE-LAB	lab(32.60, 32.93, -64.09)
CIE-LCH	lch(32.60, 72.06, 297.19°)
OKLab	oklab(43.18% -0.0084 -0.1855)
OKLCH	oklch(43.18% 0.186 267.4)
XYZ	xyz(10.8317, 7.3541, 44.0198)
Luminance	0.0736 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2540B4 #B49925

analogous

#2588B4 #2540B4 #5125B4

triadic

#2540B4 #B42540 #40B425

tetradic

#2540B4 #B42588 #B49925 #25B451

square

#2540B4 #B42588 #B49925 #25B451

split-complementary

#2540B4 #B45125 #88B425

monochromatic

#101C4E #1B2E81 #2540B4 #3F5CD7 #7187E2

Accessibility & contrast

On white

8.50

#2540B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.47

#2540B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2540B4

8.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2540B4	#FFFFFF	#000000	##FFFFFF
##2540B4	1.00	8.50	2.47	8.50
#FFFFFF	8.50	1.00	21.00	1.00
#000000	2.47	21.00	1.00	21.00
##FFFFFF	8.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054B8

Deuteranopia (green-blind)

#0046B2

Tritanopia (blue-blind)

#005F74

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #2540b4;
/* rgb */ color: rgb(37, 64, 180);
/* oklch */ color: oklch(43.2% 0.186 267.4);

Tailwind

colors: {
  custom: {
    50: '#7874cb',
    500: '#2540b4',
    950: '#000000',
  },
}

SCSS

$custom: #2540b4;
$custom-light: #7874cb;
$custom-dark: #000000;

JSON

{
  "hex": "#2540b4",
  "rgb": {
    "r": 37,
    "g": 64,
    "b": 180
  },
  "hsl": {
    "h": 228.671,
    "s": 65.899,
    "l": 42.549
  },
  "oklch": {
    "l": 0.43179,
    "c": 0.18568,
    "h": 267.4
  },
  "luminance": 0.07355
}

Semantic roles & 50–950 ramp

primary

#2540B4

secondary

#C9B76C

accent

#C93FE9

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #2540B4

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

Preview Lab → · Contrast checker → · Palette generator →