Tailwind CSS v3 color

Tailwind indigo-50 #EEF2FF

Tailwind CSS v3's indigo-50 is #EEF2FF. It is an off-white in the neutral family. In OKLCH it sits at lightness 0.962 with chroma 0.018, too low for hue to matter. The nearest CSS named color is ghostwhite (#F8F8FF), ΔE2000 3.1 away.

Relative luminance: 0.8890
OKLCH L · C · h: 0.962 · 0.018 · 272.3
Best text: Black 18.78:1
Hue family: Neutral

Inspect this color Check contrast

#EEF2FF color codes

HEX: #EEF2FF
RGB: rgb(238, 242, 255)
HSL: hsl(226, 100%, 97%)
OKLCH: oklch(0.962 0.018 272.3)
OKLab: oklab(0.962 0.001 -0.018)
CIELAB (D65): L* 95.54, a* 1.06, b* -6.70
XYZ (D65): X 85.06, Y 88.90, Z 107.27
CMYK (naive): cmyk(7%, 5%, 0%, 0%)

CIELAB and XYZ use the D65 white point; CSS lab() uses D50, so paste the OKLCH or HEX value into stylesheets. CMYK here is a plain formula with no press profile.

Legibility

Contrast: is #EEF2FF accessible?

Black text on it reaches 18.78:1, passing AAA. White text fails at 1.11:1.

WCAG 2 gives the same ratio whichever color is the text; APCA does not, so its Lc changes sign and size with polarity.

Open the Contrast System

Black text on it

18.78:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +98
White text on it

1.11:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.11:1
As text on black

18.78:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −99
As text on white

1.11:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.11:1

Nearest versions that pass 4.5:1

For text on white

#737681 4.52:1

Darkening its OKLCH lightness from 0.96 to 0.57 reaches 4.52:1 on white, keeping the hue.

Compare both in the Contrast System
For text on black

#EEF2FF 18.78:1

It already reaches 18.78:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #EEF2FF live

Move lightness, chroma and hue in OKLCH, or drag on the map. The map is every lightness and chroma at the current hue: sRGB inside the solid area, Display P3 out to the dashed line.

The studio needs JavaScript.

Scale

Shades and tints of #EEF2FF

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #EEF2FF sits at step 50.

50This color#EEF2FF

White
1.11
Black
18.78
100#E7EBF5

White
1.19
Black
17.59
200#D4D7E2

White
1.43
Black
14.61
300#BABDC9

White
1.87
Black
11.21
400#9DA1AD

White
2.58
Black
8.13
500#828691

White
3.64
Black
5.76
600#6B6E79

White
5.08
Black
4.13
700#545862

White
7.12
Black
2.94
800#3D3F49

White
10.47
Black
2.00
900#262931

White
14.54
Black
1.44
950#14161C

White
18.08
Black
1.16

Under each step, white and black text on it; a bold figure passes 4.5:1.

Tailwind CSS v3 indigo scale

The real Tailwind palette, for comparison with the computed ramp above.

50This color#EEF2FF

White
1.11
Black
18.78
100#E0E7FF
White
1.23
Black
17.04
200#C7D2FE
White
1.49
Black
14.07
300#A5B4FC
White
1.99
Black
10.53
400#818CF8
White
2.98
Black
7.04
500#6366F1
White
4.46
Black
4.70
600#4F46E5
White
6.28
Black
3.33
700#4338CA
White
7.90
Black
2.65
800#3730A3
White
9.93
Black
2.11
900#312E81
White
11.42
Black
1.83
950#1E1B4B
White
15.98
Black
1.31

Gamut

How vivid #EEF2FF can get

A gray has no hue, so no gamut holds a more vivid version of #EEF2FF: more chroma would make it another color.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.018
sRGB edge: No hue
Display P3 edge: No hue
Rec. 2020 edge: No hue
Dominant wavelength: 474 nm
Excitation purity: 5%
Chromaticity: x 0.3025, y 0.3161

Mixing

Mixing #EEF2FF

Each row is the same mix worked out in a different space, with the halfway color at its end. sRGB, which older CSS gradients use, can sag gray or dark in the middle; OKLab keeps the lightness steps even; OKLCH holds chroma and hue as it goes.

White #FFFFFF

sRGB50%#F7F9FF
OKLab50%#F6F9FF
OKLCH50%#F6F9FF

Black #000000

sRGB50%#777980
OKLab50%#5C5E63
OKLCH50%#5C5E63

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #eef2ff, white);
color: color-mix(in oklch, #eef2ff 50%, white);

In use

#EEF2FF in an interface

A button, a link, a heading, a focused field, an icon and a chart line in this color, on a light page and a dark one. Each check is a WCAG 2 contrast minimum: 1.4.3 for text, 1.4.11 for the rest.

Light page

Button labelText, 4.5:118.78:1 Passes
Link and body-size textText, 4.5:11.11:1 Fails
Large headingLarge text, 3:11.11:1 Fails
Icons, borders and focus ringsNon-text, 3:11.11:1 Fails

For text on this page, the nearest shade that passes is #737681 4.52:1

Dark page

Button labelText, 4.5:118.78:1 Passes
Link and body-size textText, 4.5:116.75:1 Passes
Large headingLarge text, 3:116.75:1 Passes
Icons, borders and focus ringsNon-text, 3:116.75:1 Passes

Color vision

How #EEF2FF looks with color blindness

As a neutral it barely changes under any simulation, ΔE2000 6.6 at most.

Simulated with Machado et al. (2009) at full severity, in linear light.

Simulate a whole page What each type sees

Protanopia

No working red (long-wavelength) cones

#EFF3FF ΔE2000 0.5

Imperceptible

Reads as off-white
Deuteranopia

No working green (medium-wavelength) cones

#EDF2FF ΔE2000 0.5

Imperceptible

Reads as off-white
Tritanopia

No working blue (short-wavelength) cones

#EAF4F6 ΔE2000 6.6

Noticeable

Reads as off-white
Achromatopsia

No cone color vision; lightness only

#F2F2F2 ΔE2000 6.0

Noticeable

Reads as off-white

Pairing check

A near-neutral has no complementary hue to pair with, so tell it apart from neighboring grays by lightness contrast alone.

Harmony

Color harmonies for #EEF2FF

A neutral has no hue to rotate, so every harmony collapses back to the same gray. Pair it with an accent color instead.

Or pair it by lightness: steps of its own scale as text on it, and what each can carry.

Build a lightness scale in Harmony Studio

Step 950 #14161C · 16.17:1

Body text, AAA
Step 700 #545862 · 6.36:1

Body text, AA
Step 300 #BABDC9 · 1.67:1

Decoration only, under 3:1

Code

Design tokens

Ready-to-paste tokens in six formats. Rename them to fit your system.

CSS custom property

:root {
  --color-indigo-50: #eef2ff;
}

Tailwind config

// tailwind.config.js — already built in as indigo-50;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        indigo: { 50: '#eef2ff' },
      },
    },
  },
};

Tailwind v4 theme

/* app.css — Tailwind CSS v4 */
@import "tailwindcss";

@theme {
  /* v4 has its own indigo-50; this pins the v3 value. */
  --color-indigo-50: oklch(0.962 0.018 272.3);
}

Design token (W3C DTCG)

{
  "color": {
    "indigo-50": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.9333, 0.949, 1],
        "hex": "#eef2ff"
      },
      "$description": "Tailwind CSS v3 indigo-50"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let indigo50 = Color(.sRGB, red: 0.933, green: 0.949, blue: 1.000, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Indigo50 = Color(0xFFEEF2FF)
}

Matches

The nearest match in each system

The closest CSS name, Tailwind shade, RAL Classic paint and Crayola crayon by ΔE2000; under 2 is hard to tell apart side by side. RAL and Crayola values approximate physical colors.

Tools

Open #EEF2FF in the tools

Each opens over this page. More colors live in the Color Library, and every color page is listed on the hub.