Tailwind CSS v3 color

Tailwind indigo-950 #1E1B4B

Tailwind CSS v3's indigo-950 is #1E1B4B. It is a very dark muted blue in the blue family. In OKLCH it sits at lightness 0.257, chroma 0.086 and hue 281.3°. The nearest CSS named color is midnightblue (#191970), ΔE2000 7.9 away.

Relative luminance: 0.0157
OKLCH L · C · h: 0.257 · 0.086 · 281.3
Best text: White 15.98:1
Hue family: Blue

Inspect this color Check contrast

#1E1B4B color codes

HEX: #1E1B4B
RGB: rgb(30, 27, 75)
HSL: hsl(244, 47%, 20%)
OKLCH: oklch(0.257 0.086 281.3)
OKLab: oklab(0.257 0.017 -0.084)
CIELAB (D65): L* 13.03, a* 17.29, b* -29.46
XYZ (D65): X 2.20, Y 1.57, Z 6.84
CMYK (naive): cmyk(60%, 64%, 0%, 71%)

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 #1E1B4B accessible?

White text on it reaches 15.98:1, passing AAA. Black text fails at 1.31:1.

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

1.31:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.31:1
White text on it

15.98:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −105
As text on black

1.31:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.31:1
As text on white

15.98:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +102

Nearest versions that pass 4.5:1

For text on white

#1E1B4B 15.98:1

It already reaches 15.98:1 on white, so no change is needed.
For text on black

#6E70A8 4.54:1

Lightening its OKLCH lightness from 0.26 to 0.57 reaches 4.54:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #1E1B4B 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 #1E1B4B

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #1E1B4B sits at step 900.

50#F3F4FF

White
1.09
Black
19.19
100#E7E9FF

White
1.20
Black
17.49
200#D0D4FF

White
1.44
Black
14.54
300#B4B8F1

White
1.89
Black
11.06
400#989CD6

White
2.60
Black
8.06
500#7D80B9

White
3.71
Black
5.66
600#66689F

White
5.19
Black
4.04
700#505285

White
7.27
Black
2.88
800#393A68

White
10.61
Black
1.97
900This color#1E1B4B

White
15.98
Black
1.31
950#121032

White
18.32
Black
1.14

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.

50#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
950This color#1E1B4B

White
15.98
Black
1.31

Gamut

How vivid #1E1B4B can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.155; #1E1B4B uses 56% of it. Display P3 reaches no further at this hue.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.086
sRGB edge: 0.155
Display P3 edge: 0.157
Rec. 2020 edge: 0.169
Dominant wavelength: 462 nm
Excitation purity: 61%
Chromaticity: x 0.2071, y 0.1478

This color#1E1B4B
Most vivid in sRGB#20006A
Most vivid in Display P3oklch(0.257 0.157 281.3)

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

Use the wider color where screens show it

.accent {
  color: #1e1b4b;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.1111 0 0.4008); }
}

Mixing

Mixing #1E1B4B

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%#8F8DA5
OKLab50%#8486A3
OKLCH50%#8486A3

Black #000000

sRGB50%#0F0E26
OKLab50%#050517
OKLCH50%#050517

Its complement #292400

sRGB50%#242026
OKLab50%#22232B
OKLCH50%#002A29

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #1e1b4b, white);
color: color-mix(in oklch, #1e1b4b 50%, white);

In use

#1E1B4B 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, 4.5:115.98:1 Passes
Link and body-size textText, 4.5:115.98:1 Passes
Large headingLarge text, 3:115.98:1 Passes
Icons, borders and focus ringsNon-text, 3:115.98:1 Passes

Dark page

Button labelText, 4.5:115.98:1 Passes
Link and body-size textText, 4.5:11.17:1 Fails
Large headingLarge text, 3:11.17:1 Fails
Icons, borders and focus ringsNon-text, 3:11.17:1 Fails

For text on this page, the nearest shade that passes is #7578B0 4.52:1

Color vision

How #1E1B4B looks with color blindness

Achromatopsia changes it most, ΔE2000 20.4; deuteranopia changes it least, 6.6.

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

#00234D ΔE2000 7.4

Noticeable

Reads as very dark muted blue
Deuteranopia

No working green (medium-wavelength) cones

#00204A ΔE2000 6.6

Noticeable

Reads as very dark muted blue
Tritanopia

No working blue (short-wavelength) cones

#092630 ΔE2000 16.8

Distinct

Reads as very dark grayish blue
Achromatopsia

No cone color vision; lightness only

#222222 ΔE2000 20.4

Distinct

Reads as near-black

Pairing check

Checked against its complement, #292400. Their lightness contrast is only 1.02:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#1E1B4B · #292400	38.3	Stays distinct
Protanopia	#00234D · #292300	35.0	Stays distinct
Deuteranopia	#00204A · #2A2502	35.7	Stays distinct
Tritanopia	#092630 · #2D201D	21.0	Stays distinct
Achromatopsia	#222222 · #242424	0.6	Easily confused

Harmony

Color harmonies for #1E1B4B

Its complement is #292400, a very dark muted yellow.

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

Open the Harmony Studio

Base#1E1B4B
Complement#292400

Complementary

Open in Harmony Studio

−30°#002446
Base#1E1B4B
+30°#311341

Analogous

Open in Harmony Studio

Base#1E1B4B
+120°#411200
+240°#002C1A

Triadic

Open in Harmony Studio

Base#1E1B4B
+150°#341E00
+210°#162A00

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-950: #1e1b4b;
}

Tailwind config

// tailwind.config.js — already built in as indigo-950;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        indigo: { 950: '#1e1b4b' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own indigo-950; this pins the v3 value. */
  --color-indigo-950: oklch(0.257 0.086 281.3);
}

Design token (W3C DTCG)

{
  "color": {
    "indigo-950": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.1176, 0.1059, 0.2941],
        "hex": "#1e1b4b"
      },
      "$description": "Tailwind CSS v3 indigo-950"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let indigo950 = Color(.sRGB, red: 0.118, green: 0.106, blue: 0.294, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Indigo950 = Color(0xFF1E1B4B)
}

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 #1E1B4B in the tools

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

Tailwind indigo-950 #1E1B4B

#1E1B4B color codes

Contrast: is #1E1B4B 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 #1E1B4B live

Shades and tints of #1E1B4B

Tailwind CSS v3 indigo scale

How vivid #1E1B4B can get

Mixing #1E1B4B

#1E1B4B in an interface

How #1E1B4B looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #1E1B4B

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 #1E1B4B in the tools