#FFFF40#FFFF40

#FFFF40 is a very light, vivid yellow. Relative luminance 0.931; OKLCH L 97.0% C 0.195 H 109.5°. Best body text is #000000 at 19.63:1 contrast (WCAG AA passes).

Color values

HEX	#FFFF40
RGB	rgb(255, 255, 64)
HSL	hsl(60, 100%, 63%)
HSV	hsv(60, 75%, 100%)
CMYK	cmyk(0%, 0%, 74.9%, 0%)
CIE-LAB	lab(97.29, -20.34, 84.11)
CIE-LCH	lch(97.29, 86.53, 103.60°)
OKLab	oklab(96.97% -0.0652 0.1837)
OKLCH	oklch(96.97% 0.195 109.5)
XYZ	xyz(77.9283, 93.1525, 18.7247)
Luminance	0.9315 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#FFFF40 #4040FF

analogous

#FF9F40 #FFFF40 #9FFF40

triadic

#FFFF40 #40FFFF #FF40FF

tetradic

#FFFF40 #40FF9F #4040FF #FF409F

square

#FFFF40 #40FF9F #4040FF #FF409F

split-complementary

#FFFF40 #409FFF #9F40FF

monochromatic

#C5C500 #FFFF03 #FFFF40 #FFFF7D #FFFFBA

Accessibility & contrast

On white

1.07

#FFFF40 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.63

#FFFF40 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #FFFF40

19.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##FFFF40	#FFFFFF	#000000	##000000
##FFFF40	1.00	1.07	19.63	19.63
#FFFFFF	1.07	1.00	21.00	21.00
#000000	19.63	21.00	1.00	1.00
##000000	19.63	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF406

Deuteranopia (green-blind)

#FFFA50

Tritanopia (blue-blind)

#FFEFDB

Achromatopsia (no color)

#F7F7F7

Design tokens & code

CSS

--color: #ffff40;
/* rgb */ color: rgb(255, 255, 64);
/* oklch */ color: oklch(97.0% 0.195 109.5);

Tailwind

colors: {
  custom: {
    50: '#ffff84',
    500: '#ffff40',
    950: '#000000',
  },
}

SCSS

$custom: #ffff40;
$custom-light: #ffff84;
$custom-dark: #000000;

JSON

{
  "hex": "#ffff40",
  "rgb": {
    "r": 255,
    "g": 255,
    "b": 64
  },
  "hsl": {
    "h": 60,
    "s": 100,
    "l": 62.549
  },
  "oklch": {
    "l": 0.96966,
    "c": 0.19495,
    "h": 109.5
  },
  "luminance": 0.9315
}

Semantic roles & 50–950 ramp

primary

#FFFF40

secondary

#2222C1

accent

#00E600

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#19170C

muted

#87857F

Preview Lab

Preview with #FFFF40

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

Preview Lab → · Contrast checker → · Palette generator →