Color reference

#EFF7FF color reference

Very Light Neutral

This is a very light neutral because its OKLCH chroma falls below the deterministic hue-family threshold. Its closest standardized CSS named color is Alice Blue (#F0F8FF), measured with straight-line OKLab distance.

Descriptive label
Very Light Neutral
Recommended text
Black · 19.42:1
Relative luminance
0.920923
Build a palette from #EFF7FF in Palette Generator Convert #EFF7FF in Color Converter
Formats UI preview Contrast 50–900 scale Harmonies Matches Related colors Color vision Exports

Copyable values

#EFF7FF in common color formats

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

Color conversions for #EFF7FF
Format Value Action
HEX #EFF7FF
RGB rgb(239 247 255)
HSL hsl(210 100% 96.86%)
HSV hsv(210 6.27% 100%)
HWB hwb(210 93.73% 0%)
XYZ D65 color(xyz-d65 0.869032 0.920919 1.078082)
LAB lab(96.7978% -1.6355 -4.8163)
LCH lch(96.7978% 5.0864 251.2443)
OKLAB oklab(97.2443% -0.005136 -0.012693)
OKLCH oklch(97.2443% 0.013693 247.968)

Real-world test

Try #EFF7FF 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 #EFF7FF with black text at 19.42:1.

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 #EFF7FF 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 #EFF7FF Exact pair assessment Results for source text on black appear below.

On black

19.42:1

  • 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

#EFF7FF 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 #EFF7FF at 19.42:1. This validates only that text pair, not hover, focus, disabled, or adjacent-color states.

Restrained neutral

Palette role

Its OKLCH chroma of 0.0137 is restrained, which is generally more suitable for surfaces, borders, or neutral system roles than for a vivid accent.

Pair available

Color used as foreground

The stronger black/white background is black at 19.42:1. Always retest against the actual rendered background and text size.

Tested backgrounds

Foreground pairing comparison

#EFF7FF foreground contrast on tested backgrounds
Pair Background Contrast ratio
Black#000000 19.42:1
Hue Codex ink#10212B 15.24:1
White#FFFFFF 1.08:1
Soft neutral#F2EFE6 1.06:1
Hue Codex paper#FBFAF5 1.03:1
Check #EFF7FF 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 #EFF7FF Source
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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 #EFF7FF 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.

Hue relationships are not meaningful for this near-neutral color

Its OKLCH chroma is too low for hue rotation to produce a trustworthy complementary or triadic recommendation. Use the lightness scale or pair it with a deliberately selected accent instead.

Explore #EFF7FF 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

Alice Blue

#F0F8FF

OKLab distance ×100: 0.3

Tailwind v4 default

blue-50

oklch(97% 0.014 254.604)

OKLab distance ×100: 0.29 · sRGB preview #EFF6FF

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#EFF7FF
Approx.

Protanopia

Red-vision deficiency approximation

Original#EFF7FF
Approx.

Deuteranopia

Green-vision deficiency approximation

Original#EFF7FF
Approx.

Tritanopia

Blue-yellow deficiency approximation

Original#EFF7FF
Approx.

Achromatopsia

Monochromatic-vision approximation

Test #EFF7FF 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: #EFF7FF;
  --color-on-primary: #000000;
  --color-primary-oklch: oklch(97.2443% 0.013693 247.968);
  --color-primary-50: #EFF7FF;
  --color-primary-100: #D7DFE7;
  --color-primary-200: #BEC5CC;
  --color-primary-300: #A5ACB3;
  --color-primary-400: #8C939A;
  --color-primary-500: #757B81;
  --color-primary-600: #5E646A;
  --color-primary-700: #484E53;
  --color-primary-800: #33393E;
  --color-primary-900: #202529;
}

Tailwind v4 CSS-first theme

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

@import "tailwindcss";

@theme {
  --color-brand: #EFF7FF;
  --color-brand-foreground: #000000;
  --color-brand-50: #EFF7FF;
  --color-brand-100: #D7DFE7;
  --color-brand-200: #BEC5CC;
  --color-brand-300: #A5ACB3;
  --color-brand-400: #8C939A;
  --color-brand-500: #757B81;
  --color-brand-600: #5E646A;
  --color-brand-700: #484E53;
  --color-brand-800: #33393E;
  --color-brand-900: #202529;
}

Tailwind v3 / legacy config

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

module.exports = {
  theme: {
    extend: {
      colors: {
        brand: {
          '50': '#EFF7FF',
          '100': '#D7DFE7',
          '200': '#BEC5CC',
          '300': '#A5ACB3',
          '400': '#8C939A',
          '500': '#757B81',
          '600': '#5E646A',
          '700': '#484E53',
          '800': '#33393E',
          '900': '#202529',
          DEFAULT: '#EFF7FF',
          foreground: '#000000',
        },
      },
    },
  },
};

Sass variables

Semantic source, foreground, OKLCH, and scale variables.

$color-primary: #EFF7FF;
$color-on-primary: #000000;
$color-primary-oklch: oklch(97.2443% 0.013693 247.968);
$color-primary-50: #EFF7FF;
$color-primary-100: #D7DFE7;
$color-primary-200: #BEC5CC;
$color-primary-300: #A5ACB3;
$color-primary-400: #8C939A;
$color-primary-500: #757B81;
$color-primary-600: #5E646A;
$color-primary-700: #484E53;
$color-primary-800: #33393E;
$color-primary-900: #202529;

Modern color-mix()

Static fallbacks followed by OKLab tint and shade declarations.

:root {
  --color-primary: #EFF7FF;
  --color-primary-tint: #BEC5CC;
  --color-primary-tint: color-mix(in oklab, var(--color-primary) 72%, white);
  --color-primary-shade: #484E53;
  --color-primary-shade: color-mix(in oklab, var(--color-primary) 82%, black);
}

JSON design data

Source formats, readable text, and the generated scale.

{
    "name": "Very Light Neutral",
    "hex": "#EFF7FF",
    "rgb": "rgb(239 247 255)",
    "oklch": "oklch(97.2443% 0.013693 247.968)",
    "recommendedText": "#000000",
    "scale": {
        "50": "#EFF7FF",
        "100": "#D7DFE7",
        "200": "#BEC5CC",
        "300": "#A5ACB3",
        "400": "#8C939A",
        "500": "#757B81",
        "600": "#5E646A",
        "700": "#484E53",
        "800": "#33393E",
        "900": "#202529"
    }
}

Continue the decision

Use #EFF7FF 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 #EFF7FF in Color PickerStart with this exact color and white as the working background for role and accessibility decisions. Build a palette from #EFF7FF in Palette GeneratorUse this exact HEX as the seed for a deterministic, role-based palette. Check #EFF7FF on white in Contrast CheckerStart with this color as the foreground and white as the background, then test the real pair.