#303B78#303B78

#303B78 is a dark, moderate blue. Relative luminance 0.051; OKLCH L 37.7% C 0.104 H 272.8°. Best body text is #FFFFFF at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#303B78
RGB	rgb(48, 59, 120)
HSL	hsl(231, 43%, 33%)
HSV	hsv(231, 60%, 47%)
CMYK	cmyk(60%, 50.8%, 0%, 52.9%)
CIE-LAB	lab(27.05, 15.40, -36.40)
CIE-LCH	lch(27.05, 39.53, 292.94°)
OKLab	oklab(37.69% 0.005 -0.104)
OKLCH	oklch(37.69% 0.104 272.8)
XYZ	xyz(6.1719, 5.1119, 18.4271)
Luminance	0.0511 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303B78 #786D30

analogous

#305F78 #303B78 #493078

triadic

#303B78 #78303B #3B7830

tetradic

#303B78 #78305F #786D30 #307849

square

#303B78 #78305F #786D30 #307849

split-complementary

#303B78 #784930 #5F7830

monochromatic

#0D1021 #1F264C #303B78 #4150A4 #6271C0

Accessibility & contrast

On white

10.38

#303B78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#303B78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303B78

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303B78	#FFFFFF	#000000	##FFFFFF
##303B78	1.00	10.38	2.02	10.38
#FFFFFF	10.38	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1D437A

Deuteranopia (green-blind)

#113D77

Tritanopia (blue-blind)

#014953

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #303b78;
/* rgb */ color: rgb(48, 59, 120);
/* oklch */ color: oklch(37.7% 0.104 272.8);

Tailwind

colors: {
  custom: {
    50: '#6f709f',
    500: '#303b78',
    950: '#000000',
  },
}

SCSS

$custom: #303b78;
$custom-light: #6f709f;
$custom-dark: #000000;

JSON

{
  "hex": "#303b78",
  "rgb": {
    "r": 48,
    "g": 59,
    "b": 120
  },
  "hsl": {
    "h": 230.833,
    "s": 42.857,
    "l": 32.941
  },
  "oklch": {
    "l": 0.37694,
    "c": 0.10409,
    "h": 272.8
  },
  "luminance": 0.05112
}

Semantic roles & 50–950 ramp

primary

#303B78

secondary

#A79C5C

accent

#BF55D3

background

#F7F6F9

surface

#EDECF2

border

#C8C7CC

text

#08070E

muted

#7B7A7E

Preview Lab

Preview with #303B78

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

Preview Lab → · Contrast checker → · Palette generator →