Tailwind CSS v3 color

Tailwind blue-950 #172554

Tailwind CSS v3's blue-950 is #172554. It is a very dark muted blue in the blue family. In OKLCH it sits at lightness 0.282, chroma 0.087 and hue 267.9°. The nearest CSS named color is midnightblue (#191970), ΔE2000 8.1 away.

Relative luminance: 0.0215
OKLCH L · C · h: 0.282 · 0.087 · 267.9
Best text: White 14.69:1
Hue family: Blue

Inspect this color Check contrast

#172554 color codes

HEX: #172554
RGB: rgb(23, 37, 84)
HSL: hsl(226, 57%, 21%)
OKLCH: oklch(0.282 0.087 267.9)
OKLab: oklab(0.282 -0.003 -0.087)
CIELAB (D65): L* 16.23, a* 12.01, b* -30.45
XYZ (D65): X 2.61, Y 2.15, Z 8.66
CMYK (naive): cmyk(73%, 56%, 0%, 67%)

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 #172554 accessible?

White text on it reaches 14.69:1, passing AAA. Black text fails at 1.42:1.

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

1.42:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.42:1
White text on it

14.69:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −104
As text on black

1.42:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.42:1
As text on white

14.69:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +101

Nearest versions that pass 4.5:1

For text on white

#172554 14.69:1

It already reaches 14.69:1 on white, so no change is needed.
For text on black

#5F73A9 4.51:1

Lightening its OKLCH lightness from 0.28 to 0.56 reaches 4.51:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #172554 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 #172554

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #172554 sits at step 900.

50#F1F5FF

White
1.09
Black
19.24
100#E3EBFF

White
1.19
Black
17.59
200#C7D7FF

White
1.43
Black
14.59
300#A7BCF4

White
1.88
Black
11.14
400#8AA0D8

White
2.59
Black
8.10
500#6F84BB

White
3.68
Black
5.69
600#596CA2

White
5.13
Black
4.09
700#445688

White
7.16
Black
2.93
800#2D3D6A

White
10.56
Black
1.98
900This color#172554

White
14.69
Black
1.42
950#091333

White
18.22
Black
1.15

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

Tailwind CSS v3 blue scale

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

50#EFF6FF
White
1.08
Black
19.29
100#DBEAFE
White
1.22
Black
17.21
200#BFDBFE
White
1.42
Black
14.77
300#93C5FD
White
1.80
Black
11.64
400#60A5FA
White
2.54
Black
8.25
500#3B82F6
White
3.67
Black
5.70
600#2563EB
White
5.16
Black
4.06
700#1D4ED8
White
6.70
Black
3.13
800#1E40AF
White
8.72
Black
2.40
900#1E3A8A
White
10.35
Black
2.02
950This color#172554

White
14.69
Black
1.42

Gamut

How vivid #172554 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.189; #172554 uses 46% of it. Display P3 reaches no further at this hue.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.087
sRGB edge: 0.189
Display P3 edge: 0.189
Rec. 2020 edge: 0.201
Dominant wavelength: 470 nm
Excitation purity: 62%
Chromaticity: x 0.1948, y 0.1598

This color#172554
Most vivid in sRGB#0E0084
Most vivid in Display P3oklch(0.282 0.189 267.9)

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

Use the wider color where screens show it

.accent {
  color: #172554;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.0453 0 0.4972); }
}

Mixing

Mixing #172554

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%#8B92AA
OKLab50%#818CA8
OKLCH50%#818CA8

Black #000000

sRGB50%#0C132A
OKLab50%#04081B
OKLCH50%#04081B

Its complement #352700

sRGB50%#26262A
OKLab50%#262931
OKLCH50%#441729

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #172554, white);
color: color-mix(in oklch, #172554 50%, white);

In use

#172554 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, 4.5:114.69:1 Passes
Link and body-size textText, 4.5:114.69:1 Passes
Large headingLarge text, 3:114.69:1 Passes
Icons, borders and focus ringsNon-text, 3:114.69:1 Passes

Dark page

Button labelText, 4.5:114.69:1 Passes
Link and body-size textText, 4.5:11.27:1 Fails
Large headingLarge text, 3:11.27:1 Fails
Icons, borders and focus ringsNon-text, 3:11.27:1 Fails

For text on this page, the nearest shade that passes is #677CB3 4.55:1

Color vision

How #172554 looks with color blindness

Achromatopsia changes it most, ΔE2000 19.5; deuteranopia changes it least, 3.5.

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

#092B56 ΔE2000 4.0

Close match

Reads as very dark muted blue
Deuteranopia

No working green (medium-wavelength) cones

#002653 ΔE2000 3.5

Close match

Reads as very dark muted blue
Tritanopia

No working blue (short-wavelength) cones

#003038 ΔE2000 19.4

Distinct

Reads as very dark grayish teal
Achromatopsia

No cone color vision; lightness only

#282828 ΔE2000 19.5

Distinct

Reads as near-black

Pairing check

Checked against its complement, #352700. Their lightness contrast is only 1.00:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#172554 · #352700	36.8	Stays distinct
Protanopia	#092B56 · #2D2700	36.3	Stays distinct
Deuteranopia	#002653 · #312A01	37.7	Stays distinct
Tritanopia	#003038 · #3B2220	33.5	Stays distinct
Achromatopsia	#282828 · #292929	0.3	Easily confused

Harmony

Color harmonies for #172554

Its complement is #352700, a very dark muted brown, on the warm side of the wheel.

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

Open the Harmony Studio

Base#172554
Complement#352700

Complementary

Open in Harmony Studio

−30°#002D45
Base#172554
+30°#2F1D4E

Analogous

Open in Harmony Studio

Base#172554
+120°#4C120E
+240°#00340F

Triadic

Open in Harmony Studio

Base#172554
+150°#411F00
+210°#272D00

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-blue-950: #172554;
}

Tailwind config

// tailwind.config.js — already built in as blue-950;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        blue: { 950: '#172554' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own blue-950; this pins the v3 value. */
  --color-blue-950: oklch(0.282 0.087 267.9);
}

Design token (W3C DTCG)

{
  "color": {
    "blue-950": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.0902, 0.1451, 0.3294],
        "hex": "#172554"
      },
      "$description": "Tailwind CSS v3 blue-950"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let blue950 = Color(.sRGB, red: 0.090, green: 0.145, blue: 0.329, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Blue950 = Color(0xFF172554)
}

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 #172554 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 blue-950 #172554

#172554 color codes

Contrast: is #172554 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 #172554 live

Shades and tints of #172554

Tailwind CSS v3 blue scale

How vivid #172554 can get

Mixing #172554

#172554 in an interface

How #172554 looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #172554

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 #172554 in the tools