#304D8B#304D8B

#304D8B is a dark, moderate blue. Relative luminance 0.078; OKLCH L 43.1% C 0.108 H 263.6°. Best body text is #FFFFFF at 8.20:1 contrast (WCAG AA passes).

Color values

HEX	#304D8B
RGB	rgb(48, 77, 139)
HSL	hsl(221, 49%, 37%)
HSV	hsv(221, 65%, 55%)
CMYK	cmyk(65.5%, 44.6%, 0%, 45.5%)
CIE-LAB	lab(33.56, 10.24, -37.79)
CIE-LCH	lch(33.56, 39.15, 285.17°)
OKLab	oklab(43.07% -0.0121 -0.1078)
OKLCH	oklch(43.07% 0.108 263.6)
XYZ	xyz(8.5314, 7.7994, 25.4769)
Luminance	0.0780 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#304D8B #8B6E30

analogous

#307B8B #304D8B #41308B

triadic

#304D8B #8B304D #4D8B30

tetradic

#304D8B #8B307B #8B6E30 #308B41

square

#304D8B #8B307B #8B6E30 #308B41

split-complementary

#304D8B #8B4130 #7B8B30

monochromatic

#111B30 #20345E #304D8B #4066B8 #6A89CC

Accessibility & contrast

On white

8.20

#304D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.56

#304D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #304D8B

8.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##304D8B	#FFFFFF	#000000	##FFFFFF
##304D8B	1.00	8.20	2.56	8.20
#FFFFFF	8.20	1.00	21.00	1.00
#000000	2.56	21.00	1.00	21.00
##FFFFFF	8.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#30538D

Deuteranopia (green-blind)

#224B8A

Tritanopia (blue-blind)

#005B65

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #304d8b;
/* rgb */ color: rgb(48, 77, 139);
/* oklch */ color: oklch(43.1% 0.108 263.6);

Tailwind

colors: {
  custom: {
    50: '#727ead',
    500: '#304d8b',
    950: '#000000',
  },
}

SCSS

$custom: #304d8b;
$custom-light: #727ead;
$custom-dark: #000000;

JSON

{
  "hex": "#304d8b",
  "rgb": {
    "r": 48,
    "g": 77,
    "b": 139
  },
  "hsl": {
    "h": 220.879,
    "s": 48.663,
    "l": 36.667
  },
  "oklch": {
    "l": 0.43068,
    "c": 0.10849,
    "h": 263.6
  },
  "luminance": 0.078
}

Semantic roles & 50–950 ramp

primary

#304D8B

secondary

#B39A64

accent

#AD50D8

background

#F7F7FA

surface

#EDEEF4

border

#C8C9CE

text

#080910

muted

#7B7B7F

Preview Lab

Preview with #304D8B

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

Preview Lab → · Contrast checker → · Palette generator →