CSS named color

Indigo #4B0082

The CSS keyword indigo is #4B0082. It is a dark vivid violet in the violet family. In OKLCH it sits at lightness 0.339, chroma 0.179 and hue 301.7°.

Relative luminance: 0.0311
OKLCH L · C · h: 0.339 · 0.179 · 301.7
Best text: White 12.95:1
Hue family: Violet

Inspect this color Check contrast

#4B0082 color codes

HEX: #4B0082
RGB: rgb(75, 0, 130)
HSL: hsl(275, 100%, 25%)
OKLCH: oklch(0.339 0.179 301.7)
OKLab: oklab(0.339 0.094 -0.153)
CIELAB (D65): L* 20.47, a* 51.69, b* -53.31
XYZ (D65): X 6.93, Y 3.11, Z 21.35
CMYK (naive): cmyk(42%, 100%, 0%, 49%)

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 #4B0082 accessible?

White text on it reaches 12.95:1, passing AAA. Black text fails at 1.62:1.

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

1.62:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
White text on it

12.95:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −100
As text on black

1.62:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
As text on white

12.95:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +97

Nearest versions that pass 4.5:1

For text on white

#4B0082 12.95:1

It already reaches 12.95:1 on white, so no change is needed.
For text on black

#905BD2 4.61:1

Lightening its OKLCH lightness from 0.34 to 0.58 reaches 4.61:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #4B0082 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 #4B0082

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #4B0082 sits at step 800.

50#F7F3FF

White
1.09
Black
19.21
100#EFE6FF

White
1.20
Black
17.43
200#DFCDFF

White
1.46
Black
14.31
300#CCABFF

White
1.93
Black
10.83
400#B683FC

White
2.74
Black
7.64
500#9B66DE

White
3.92
Black
5.34
600#834DC3

White
5.50
Black
3.81
700#6B35A7

White
7.79
Black
2.69
800This color#4B0082

White
12.95
Black
1.62
900#380064

White
15.53
Black
1.35
950#20003D

White
18.60
Black
1.12

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

Gamut

How vivid #4B0082 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.180; #4B0082 uses 100% of it. Display P3, which many recent phones and laptops show, reaches 0.187 there: 4% more.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.179
sRGB edge: 0.180
Display P3 edge: 0.187
Rec. 2020 edge: 0.207
Dominant wavelength: Complementary 566 nm
Excitation purity: 70%
Chromaticity: x 0.2208, y 0.0990

This color#4B0082
Most vivid in sRGB#4B0082
Most vivid in Display P3oklch(0.339 0.187 301.7)

On a screen without Display P3 the last tile shows the sRGB edge instead.

Use the wider color where screens show it

.accent {
  color: #4b0082;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.2695 0 0.5017); }
}

Mixing

Mixing #4B0082

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%#A580C1
OKLab50%#9F88C3
OKLCH50%#9F88C3

Black #000000

sRGB50%#260041
OKLab50%#17002F
OKLCH50%#17002F

Its complement #313E00

sRGB50%#3E1F41
OKLab50%#3C324D
OKLCH50%#004049

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #4b0082, white);
color: color-mix(in oklch, #4b0082 50%, white);

In use

#4B0082 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, 4.5:112.95:1 Passes
Link and body-size textText, 4.5:112.95:1 Passes
Large headingLarge text, 3:112.95:1 Passes
Icons, borders and focus ringsNon-text, 3:112.95:1 Passes

Dark page

Button labelText, 4.5:112.95:1 Passes
Link and body-size textText, 4.5:11.44:1 Fails
Large headingLarge text, 3:11.44:1 Fails
Icons, borders and focus ringsNon-text, 3:11.44:1 Fails

For text on this page, the nearest shade that passes is #9762DB 4.53:1

Color vision

How #4B0082 looks with color blindness

Achromatopsia changes it most, ΔE2000 27.9; protanopia changes it least, 14.8.

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

#003185 ΔE2000 14.8

Distinct

Reads as dark soft blue
Deuteranopia

No working green (medium-wavelength) cones

#003180 ΔE2000 15.3

Distinct

Reads as dark soft blue
Tritanopia

No working blue (short-wavelength) cones

#3E2E4A ΔE2000 17.4

Distinct

Reads as dark muted violet
Achromatopsia

No cone color vision; lightness only

#313131 ΔE2000 27.9

Distinct

Reads as dark gray

Pairing check

Checked against its complement, #313E00. Their lightness contrast is only 1.12:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#4B0082 · #313E00	63.2	Stays distinct
Protanopia	#003185 · #433900	49.8	Stays distinct
Deuteranopia	#003180 · #413906	48.1	Stays distinct
Tritanopia	#3E2E4A · #343A33	21.5	Stays distinct
Achromatopsia	#313131 · #393939	2.6	Easily confused

Harmony

Color harmonies for #4B0082

Its complement is #313E00, a dark muted yellow.

Hue rotations in OKLCH, mapped into sRGB by trimming chroma so hue and lightness stay put.

Open the Harmony Studio

Base#4B0082
Complement#313E00

Complementary

Open in Harmony Studio

−30°#1F1F92
Base#4B0082
+30°#60005A

Analogous

Open in Harmony Studio

Base#4B0082
+120°#542C00
+240°#00423A

Triadic

Open in Harmony Studio

Base#4B0082
+150°#453600
+210°#00441E

Split-complementary

Open in Harmony Studio

Code

Design tokens

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

CSS custom property

:root {
  --color-indigo: #4b0082;
}

Tailwind config

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        indigo: '#4b0082',
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  --color-indigo: oklch(0.339 0.179 301.7);
}

Design token (W3C DTCG)

{
  "color": {
    "indigo": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.2941, 0, 0.5098],
        "hex": "#4b0082"
      },
      "$description": "CSS named color indigo"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let indigo = Color(.sRGB, red: 0.294, green: 0.000, blue: 0.510, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Indigo = Color(0xFF4B0082)
}

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 #4B0082 in the tools

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

Indigo #4B0082

#4B0082 color codes

Contrast: is #4B0082 accessible?

Black text on it

White text on it

As text on black

As text on white

Nearest versions that pass 4.5:1

Adjust #4B0082 live

Shades and tints of #4B0082

How vivid #4B0082 can get

Mixing #4B0082

#4B0082 in an interface

How #4B0082 looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #4B0082

Complementary

Analogous

Triadic

Split-complementary

Design tokens

CSS custom property

Tailwind config

Tailwind v4 theme

Design token (W3C DTCG)

SwiftUI color

Jetpack Compose color

The nearest match in each system

Similar colors

Open #4B0082 in the tools