#EFFF54#EFFF54

#EFFF54 is a very light, vivid yellow. Relative luminance 0.905; OKLCH L 95.8% C 0.188 H 114.6°. Best body text is #000000 at 19.10:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF54
RGB	rgb(239, 255, 84)
HSL	hsl(66, 100%, 66%)
HSV	hsv(66, 67%, 100%)
CMYK	cmyk(6.3%, 0%, 67.1%, 0%)
CIE-LAB	lab(96.21, -25.85, 76.08)
CIE-LCH	lch(96.21, 80.35, 108.77°)
OKLab	oklab(95.84% -0.078 0.1705)
OKLCH	oklch(95.84% 0.188 114.6)
XYZ	xyz(72.9588, 90.5121, 22.0130)
Luminance	0.9051 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF54 #6454FF

analogous

#FFBA54 #EFFF54 #9AFF54

triadic

#EFFF54 #54EFFF #FF54EF

tetradic

#EFFF54 #54FFBA #6454FF #FF549A

square

#EFFF54 #54FFBA #6454FF #FF549A

split-complementary

#EFFF54 #549AFF #BA54FF

monochromatic

#C4D900 #E9FF17 #EFFF54 #F5FF91 #FAFFCE

Accessibility & contrast

On white

1.10

#EFFF54 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.10

#EFFF54 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF54

19.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF54	#FFFFFF	#000000	##000000
##EFFF54	1.00	1.10	19.10	19.10
#FFFFFF	1.10	1.00	21.00	21.00
#000000	19.10	21.00	1.00	1.00
##000000	19.10	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF33A

Deuteranopia (green-blind)

#FFF661

Tritanopia (blue-blind)

#FEF1DD

Achromatopsia (no color)

#F4F4F4

Design tokens & code

CSS

--color: #efff54;
/* rgb */ color: rgb(239, 255, 84);
/* oklch */ color: oklch(95.8% 0.188 114.6);

Tailwind

colors: {
  custom: {
    50: '#f8ff8d',
    500: '#efff54',
    950: '#000000',
  },
}

SCSS

$custom: #efff54;
$custom-light: #f8ff8d;
$custom-dark: #000000;

JSON

{
  "hex": "#efff54",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 84
  },
  "hsl": {
    "h": 65.614,
    "s": 100,
    "l": 66.471
  },
  "oklch": {
    "l": 0.95843,
    "c": 0.18753,
    "h": 114.6
  },
  "luminance": 0.90511
}

Semantic roles & 50–950 ramp

primary

#EFFF54

secondary

#3525D2

accent

#00E615

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFF54

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

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