#40370B#40370B

#40370B is a dark, moderate yellow. Relative luminance 0.038; OKLCH L 33.7% C 0.061 H 97.2°. Best body text is #FFFFFF at 11.87:1 contrast (WCAG AA passes).

Color values

HEX	#40370B
RGB	rgb(64, 55, 11)
HSL	hsl(50, 71%, 15%)
HSV	hsv(50, 83%, 25%)
CMYK	cmyk(0%, 14.1%, 82.8%, 74.9%)
CIE-LAB	lab(23.16, -1.79, 27.45)
CIE-LCH	lch(23.16, 27.51, 93.73°)
OKLab	oklab(33.7% -0.0077 0.0608)
OKLCH	oklch(33.7% 0.061 97.2)
XYZ	xyz(3.5411, 3.8467, 0.8725)
Luminance	0.0385 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#40370B #0B1440

analogous

#401C0B #40370B #2F400B

triadic

#40370B #0B4037 #370B40

tetradic

#40370B #0B401C #0B1440 #400B2F

square

#40370B #0B401C #0B1440 #400B2F

split-complementary

#40370B #0B2F40 #1C0B40

monochromatic

#1A1604 #1A1604 #40370B #746414 #A8911D

Accessibility & contrast

On white

11.87

#40370B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#40370B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #40370B

11.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##40370B	#FFFFFF	#000000	##FFFFFF
##40370B	1.00	11.87	1.77	11.87
#FFFFFF	11.87	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3D3505

Deuteranopia (green-blind)

#40380E

Tritanopia (blue-blind)

#46322E

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #40370b;
/* rgb */ color: rgb(64, 55, 11);
/* oklch */ color: oklch(33.7% 0.061 97.2);

Tailwind

colors: {
  custom: {
    50: '#776d4d',
    500: '#40370b',
    950: '#000000',
  },
}

SCSS

$custom: #40370b;
$custom-light: #776d4d;
$custom-dark: #000000;

JSON

{
  "hex": "#40370b",
  "rgb": {
    "r": 64,
    "g": 55,
    "b": 11
  },
  "hsl": {
    "h": 49.811,
    "s": 70.667,
    "l": 14.706
  },
  "oklch": {
    "l": 0.33698,
    "c": 0.06131,
    "h": 97.2
  },
  "luminance": 0.03847
}

Semantic roles & 50–950 ramp

primary

#40370B

secondary

#2A387D

accent

#59ED3A

background

#F7F6F4

surface

#EDEBE7

border

#C8C6C3

text

#090701

muted

#7B7A77

Preview Lab

Preview with #40370B

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

Preview Lab → · Contrast checker → · Palette generator →