#EFFB53#EFFB53

#EFFB53 is a very light, vivid yellow. Relative luminance 0.880; OKLCH L 95.0% C 0.184 H 113.4°. Best body text is #000000 at 18.59:1 contrast (WCAG AA passes).

Color values

HEX	#EFFB53
RGB	rgb(239, 251, 83)
HSL	hsl(64, 95%, 65%)
HSV	hsv(64, 67%, 98%)
CMYK	cmyk(4.8%, 0%, 66.9%, 1.6%)
CIE-LAB	lab(95.15, -24.02, 75.38)
CIE-LCH	lch(95.15, 79.11, 107.68°)
OKLab	oklab(94.99% -0.073 0.1689)
OKLCH	oklch(94.99% 0.184 113.4)
XYZ	xyz(71.6571, 87.9711, 21.3873)
Luminance	0.8797 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFB53 #5F53FB

analogous

#FBB353 #EFFB53 #9BFB53

triadic

#EFFB53 #53EFFB #FB53EF

tetradic

#EFFB53 #53FBB3 #5F53FB #FB539B

square

#EFFB53 #53FBB3 #5F53FB #FB539B

split-complementary

#EFFB53 #539BFB #B353FB

monochromatic

#C0CF05 #E9FA17 #EFFB53 #F5FC8F #FAFECB

Accessibility & contrast

On white

1.13

#EFFB53 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.59

#EFFB53 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFB53

18.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFB53	#FFFFFF	#000000	##000000
##EFFB53	1.00	1.13	18.59	18.59
#FFFFFF	1.13	1.00	21.00	21.00
#000000	18.59	21.00	1.00	1.00
##000000	18.59	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFEF39

Deuteranopia (green-blind)

#FFF35F

Tritanopia (blue-blind)

#FEEDD9

Achromatopsia (no color)

#F1F1F1

Design tokens & code

CSS

--color: #effb53;
/* rgb */ color: rgb(239, 251, 83);
/* oklch */ color: oklch(95.0% 0.184 113.4);

Tailwind

colors: {
  custom: {
    50: '#f8fc8c',
    500: '#effb53',
    950: '#000000',
  },
}

SCSS

$custom: #effb53;
$custom-light: #f8fc8c;
$custom-dark: #000000;

JSON

{
  "hex": "#effb53",
  "rgb": {
    "r": 239,
    "g": 251,
    "b": 83
  },
  "hsl": {
    "h": 64.286,
    "s": 95.455,
    "l": 65.49
  },
  "oklch": {
    "l": 0.94992,
    "c": 0.184,
    "h": 113.4
  },
  "luminance": 0.8797
}

Semantic roles & 50–950 ramp

primary

#EFFB53

secondary

#3428CA

accent

#00E610

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFB53

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

Preview Lab → · Contrast checker → · Palette generator →