Color reference

#EFFF9C color reference

Clear Very Light Yellow-green

This is a clear, very light yellow-green under the deterministic OKLCH hue, lightness, and chroma ranges. Its closest standardized CSS named color is Khaki (#F0E68C), measured with straight-line OKLab distance.

Descriptive label
Clear Very Light Yellow-green
Recommended text
Black · 19.45:1
Relative luminance
0.922710
Build a palette from #EFFF9C in Palette Generator Convert #EFFF9C in Color Converter
Formats UI preview Contrast 50–900 scale Harmonies Matches Related colors Color vision Exports

Copyable values

#EFFF9C in common color formats

Values are calculated from the same opaque sRGB color. Display rounding does not alter the internal calculations.

Color conversions for #EFFF9C
Format Value Action
HEX #EFFF9C
RGB rgb(239 255 156)
HSL hsl(70 100% 80.59%)
HSV hsv(70 38.82% 100%)
HWB hwb(70 61.18% 0%)
XYZ D65 color(xyz-d65 0.773544 0.92271 0.451886)
LAB lab(97.1905% -16.295 45.3845)
LCH lch(97.1905% 48.2211 109.7503)
OKLAB oklab(96.6547% -0.054897 0.11119)
OKLCH oklch(96.6547% 0.124003 116.2765)

Real-world test

Try #EFFF9C on interface components

Preview the source as a primary action, subtle status, form treatment, and card surface. Persistent state controls help touch and keyboard users inspect the same normal, hover, and active colors.

Normal state uses #EFFF9C with black text at 19.45:1.

Action

Primary button

Use the controls above or point to and press the button to inspect its visual states.

Status

Subtle alert badge

A 12% source tint over white provides the background; readable text is selected separately.

Ready for review

Form

Border and focus ring

Source ring on white: 1.08:1 · does not meet the 3:1 non-text threshold where applicable.

Surface

Card component

The selected state becomes the card surface with its strongest black-or-white text pairing.

Design system Color decision ready Review states and surrounding surfaces before shipping.

Accessibility diagnostics

WCAG contrast for exact color pairs

Each result applies only to the named foreground, background, text size, and requirement. It is not a complete accessibility or component-conformance claim.

Source #EFFF9C Exact pair assessment Results for source text on white appear below.

On white

1.08:1

  • Fail AA normal text · 4.5:1
  • Fail AAA normal text · 7:1
  • Fail AA large text · 3:1
  • Fail UI/non-text where applicable · 3:1
Source #EFFF9C Exact pair assessment Results for source text on black appear below.

On black

19.45:1

  • Pass AA normal text · 4.5:1
  • Pass AAA normal text · 7:1
  • Pass AA large text · 3:1
  • Pass UI/non-text where applicable · 3:1

Use guidance

What this color may be suitable for

Not recommended

Normal-sized text

#EFFF9C does not reach 4.5:1 on white or Hue Codex paper, so it should not be used there for normal-sized text.

Needs a boundary

Controls and interface graphics

Against Hue Codex paper, the color reaches only 1.03:1. Use a contrasting border or another non-color boundary for meaningful controls and graphics.

Readable pairing available

Colored surface or button fill

Black text provides the stronger black/white pairing on #EFFF9C at 19.45:1. This validates only that text pair, not hover, focus, disabled, or adjacent-color states.

Distinctive accent

Palette role

Its OKLCH chroma of 0.124 gives it enough visual presence for an accent or primary role when the tested foreground and neighboring colors pass.

Pair available

Color used as foreground

The stronger black/white background is black at 19.45:1. Always retest against the actual rendered background and text size.

Tested backgrounds

Foreground pairing comparison

#EFFF9C foreground contrast on tested backgrounds
Pair Background Contrast ratio
Black#000000 19.45:1
Hue Codex ink#10212B 15.26:1
White#FFFFFF 1.08:1
Soft neutral#F2EFE6 1.07:1
Hue Codex paper#FBFAF5 1.03:1
Check #EFFF9C on another background in Contrast Checker

Design-system starting point

A perceptual 50–900 reference scale

The source color is preserved at the nearest lightness step. Other swatches keep its OKLCH hue, moderate chroma toward the extremes, and reduce chroma only when needed to remain in sRGB.

50 #EFFF9C Source
100
200
300
400
500
600
700
800
900

This is a Hue Codex reference scale, not a claim that the values match Tailwind, Material, or another framework’s named palette.

Adjust the #EFFF9C scale in Tints, Shades & Tones

Color relationships

Complementary, analogous, and triadic colors

Hue rotations use OKLCH while preserving lightness and requested chroma. When a rotated result falls outside sRGB, chroma is reduced deterministically and disclosed.

Complementary

Source #EFFF9C
Complement Chroma fitted to sRGB

Analogous

Source #EFFF9C
Analogous −30° Chroma fitted to sRGB
Analogous +30° Chroma fitted to sRGB

Triadic

Source #EFFF9C
Triad +120° Chroma fitted to sRGB
Triad +240° Chroma fitted to sRGB

Applied pairing

A small interface check

The source anchors the main action while the complement marks a secondary status. Contrast is selected separately for each fill.

Project color Clear Very Light Yellow-green
Complement
Explore #EFFF9C in Color Harmonies

Distance matching

Closest standardized and framework colors

Matches use straight-line OKLab distance ×100. A smaller value means the coordinates are closer in this model; it is not a claim that two tokens are interchangeable in a design system.

CSS named color

Khaki

#F0E68C

OKLab distance ×100: 6.1

Tailwind v4 default

lime-200

oklch(93.8% 0.127 124.321)

OKLab distance ×100: 3.37 · sRGB preview #D8F999

Print boundary

Pantone match not estimated

Reliable print matching needs licensed reference data plus a defined ink, paper, profile, and viewing condition.

Read the print methodology

Color-vision screening

Approximate color-vision-deficiency views

These encoded-sRGB matrix previews are screening approximations. They help reveal possible color-only distinctions but do not reproduce every person’s vision or establish accessibility conformance.

Original#EFFF9C
Approx.

Protanopia

Red-vision deficiency approximation

Original#EFFF9C
Approx.

Deuteranopia

Green-vision deficiency approximation

Original#EFFF9C
Approx.

Tritanopia

Blue-yellow deficiency approximation

Original#EFFF9C
Approx.#EFEFEF

Achromatopsia

Monochromatic-vision approximation

Test #EFFF9C with a complete palette in the CVD Simulator

Ready to use

Copy framework-ready color tokens

Exports preserve the source, readable foreground, and generated 50–900 scale. Tailwind v4 CSS-first and Tailwind v3 JavaScript-config formats are labeled separately.

CSS custom properties

Semantic aliases and the complete 50–900 scale.

:root {
  --color-primary: #EFFF9C;
  --color-on-primary: #000000;
  --color-primary-oklch: oklch(96.6547% 0.124003 116.2765);
  --color-primary-50: #EFFF9C;
  --color-primary-100: #D9E888;
  --color-primary-200: #C0CE71;
  --color-primary-300: #A7B45A;
  --color-primary-400: #8E9B43;
  --color-primary-500: #77822C;
  --color-primary-600: #606A11;
  --color-primary-700: #4B5300;
  --color-primary-800: #363C00;
  --color-primary-900: #232700;
}

Tailwind v4 CSS-first theme

Current @theme syntax for bg-brand, text-brand, and scale utilities.

@import "tailwindcss";

@theme {
  --color-brand: #EFFF9C;
  --color-brand-foreground: #000000;
  --color-brand-50: #EFFF9C;
  --color-brand-100: #D9E888;
  --color-brand-200: #C0CE71;
  --color-brand-300: #A7B45A;
  --color-brand-400: #8E9B43;
  --color-brand-500: #77822C;
  --color-brand-600: #606A11;
  --color-brand-700: #4B5300;
  --color-brand-800: #363C00;
  --color-brand-900: #232700;
}

Tailwind v3 / legacy config

CommonJS theme.extend.colors for JavaScript-config projects.

module.exports = {
  theme: {
    extend: {
      colors: {
        brand: {
          '50': '#EFFF9C',
          '100': '#D9E888',
          '200': '#C0CE71',
          '300': '#A7B45A',
          '400': '#8E9B43',
          '500': '#77822C',
          '600': '#606A11',
          '700': '#4B5300',
          '800': '#363C00',
          '900': '#232700',
          DEFAULT: '#EFFF9C',
          foreground: '#000000',
        },
      },
    },
  },
};

Sass variables

Semantic source, foreground, OKLCH, and scale variables.

$color-primary: #EFFF9C;
$color-on-primary: #000000;
$color-primary-oklch: oklch(96.6547% 0.124003 116.2765);
$color-primary-50: #EFFF9C;
$color-primary-100: #D9E888;
$color-primary-200: #C0CE71;
$color-primary-300: #A7B45A;
$color-primary-400: #8E9B43;
$color-primary-500: #77822C;
$color-primary-600: #606A11;
$color-primary-700: #4B5300;
$color-primary-800: #363C00;
$color-primary-900: #232700;

Modern color-mix()

Static fallbacks followed by OKLab tint and shade declarations.

:root {
  --color-primary: #EFFF9C;
  --color-primary-tint: #C0CE71;
  --color-primary-tint: color-mix(in oklab, var(--color-primary) 72%, white);
  --color-primary-shade: #4B5300;
  --color-primary-shade: color-mix(in oklab, var(--color-primary) 82%, black);
}

JSON design data

Source formats, readable text, and the generated scale.

{
    "name": "Clear Very Light Yellow-green",
    "hex": "#EFFF9C",
    "rgb": "rgb(239 255 156)",
    "oklch": "oklch(96.6547% 0.124003 116.2765)",
    "recommendedText": "#000000",
    "scale": {
        "50": "#EFFF9C",
        "100": "#D9E888",
        "200": "#C0CE71",
        "300": "#A7B45A",
        "400": "#8E9B43",
        "500": "#77822C",
        "600": "#606A11",
        "700": "#4B5300",
        "800": "#363C00",
        "900": "#232700"
    }
}

Continue the decision

Use #EFFF9C in a complete workflow

Reference values are a starting point. Test the color in its real role, background, states, typography, and surrounding palette before shipping.

Adjust #EFFF9C in Color PickerStart with this exact color and white as the working background for role and accessibility decisions. Build a palette from #EFFF9C in Palette GeneratorUse this exact HEX as the seed for a deterministic, role-based palette. Check #EFFF9C on white in Contrast CheckerStart with this color as the foreground and white as the background, then test the real pair.