Tailwind CSS v3 color

Tailwind cyan-900 #164E63

Tailwind CSS v3's cyan-900 is #164E63. It is a dark muted blue in the blue family. In OKLCH it sits at lightness 0.398, chroma 0.066 and hue 227.4°. The nearest CSS named color is darkslategray (#2F4F4F), ΔE2000 9.7 away.

Relative luminance: 0.0652
OKLCH L · C · h: 0.398 · 0.066 · 227.4
Best text: White 9.11:1
Hue family: Blue

Inspect this color Check contrast

#164E63 color codes

HEX: #164E63
RGB: rgb(22, 78, 99)
HSL: hsl(196, 64%, 24%)
OKLCH: oklch(0.398 0.066 227.4)
OKLab: oklab(0.398 -0.045 -0.049)
CIELAB (D65): L* 30.69, a* -10.14, b* -17.43
XYZ (D65): X 5.31, Y 6.52, Z 12.78
CMYK (naive): cmyk(78%, 21%, 0%, 61%)

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 #164E63 accessible?

White text on it reaches 9.11:1, passing AAA. Black text fails at 2.30:1.

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

2.30:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc +13
White text on it

9.11:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −95
As text on black

2.30:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc −11
As text on white

9.11:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +90

Nearest versions that pass 4.5:1

For text on white

#164E63 9.11:1

It already reaches 9.11:1 on white, so no change is needed.
For text on black

#477C92 4.56:1

Lightening its OKLCH lightness from 0.40 to 0.56 reaches 4.56:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #164E63 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 #164E63

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #164E63 sits at step 800.

50#E9F8FF

White
1.08
Black
19.33
100#D2F1FF

White
1.18
Black
17.76
200#B0E0F6

White
1.41
Black
14.83
300#93C6DD

White
1.84
Black
11.36
400#75AAC1

White
2.53
Black
8.27
500#598EA6

White
3.59
Black
5.84
600#42768D

White
4.99
Black
4.20
700#2C5F74

White
7.00
Black
2.99
800This color#164E63

White
9.11
Black
2.30
900#002E3E

White
14.38
Black
1.46
950#001924

White
18.03
Black
1.16

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

Tailwind CSS v3 cyan scale

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

50#ECFEFF
White
1.04
Black
20.18
100#CFFAFE
White
1.11
Black
18.75
200#A5F3FC
White
1.24
Black
16.82
300#67E8F9
White
1.44
Black
14.48
400#22D3EE
White
1.80
Black
11.62
500#06B6D4
White
2.42
Black
8.64
600#0891B2
White
3.68
Black
5.70
700#0E7490
White
5.35
Black
3.91
800#155E75
White
7.26
Black
2.88
900This color#164E63

White
9.11
Black
2.30
950#083344
White
13.39
Black
1.56

Gamut

How vivid #164E63 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.077; #164E63 uses 86% of it. Display P3, which many recent phones and laptops show, reaches 0.102 there: 32% more.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.066
sRGB edge: 0.077
Display P3 edge: 0.102
Rec. 2020 edge: 0.179
Dominant wavelength: 483 nm
Excitation purity: 41%
Chromaticity: x 0.2157, y 0.2650

This color#164E63
Most vivid in sRGB#004F67
Most vivid in Display P3oklch(0.398 0.102 227.4)

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

Use the wider color where screens show it

.accent {
  color: #164e63;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0 0.3083 0.4328); }
}

Mixing

Mixing #164E63

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%#8BA7B1
OKLab50%#89A3AE
OKLCH50%#89A3AE

Black #000000

sRGB50%#0B2732
OKLab50%#031921
OKLCH50%#031921

Its complement #643B26

sRGB50%#3D4545
OKLab50%#474747
OKLCH50%#563B5F

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #164e63, white);
color: color-mix(in oklch, #164e63 50%, white);

In use

#164E63 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, 4.5:19.11:1 Passes
Link and body-size textText, 4.5:19.11:1 Passes
Large headingLarge text, 3:19.11:1 Passes
Icons, borders and focus ringsNon-text, 3:19.11:1 Passes

Dark page

Button labelText, 4.5:19.11:1 Passes
Link and body-size textText, 4.5:12.05:1 Fails
Large headingLarge text, 3:12.05:1 Fails
Icons, borders and focus ringsNon-text, 3:12.05:1 Fails

For text on this page, the nearest shade that passes is #50859C 4.61:1

Color vision

How #164E63 looks with color blindness

Achromatopsia changes it most, ΔE2000 15.2; tritanopia changes it least, 11.4.

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

#434C64 ΔE2000 13.6

Distinct

Reads as dark grayish blue
Deuteranopia

No working green (medium-wavelength) cones

#384563 ΔE2000 13.4

Distinct

Reads as dark muted blue
Tritanopia

No working blue (short-wavelength) cones

#005455 ΔE2000 11.4

Distinct

Reads as dark muted teal
Achromatopsia

No cone color vision; lightness only

#484848 ΔE2000 15.2

Distinct

Reads as dark gray

Pairing check

Checked against its complement, #643B26. Their lightness contrast is only 1.04:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#164E63 · #643B26	35.3	Stays distinct
Protanopia	#434C64 · #464024	26.7	Stays distinct
Deuteranopia	#384563 · #504926	30.9	Stays distinct
Tritanopia	#005455 · #6D3336	41.6	Stays distinct
Achromatopsia	#484848 · #454545	1.0	Easily confused

Harmony

Color harmonies for #164E63

Its complement is #643B26, a 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#164E63
Complement#643B26

Complementary

Open in Harmony Studio

−30°#045254
Base#164E63
+30°#30486B

Analogous

Open in Harmony Studio

Base#164E63
+120°#61384E
+240°#4B4A1B

Triadic

Open in Harmony Studio

Base#164E63
+150°#66383A
+210°#5B4219

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-cyan-900: #164e63;
}

Tailwind config

// tailwind.config.js — already built in as cyan-900;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        cyan: { 900: '#164e63' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own cyan-900; this pins the v3 value. */
  --color-cyan-900: oklch(0.398 0.066 227.4);
}

Design token (W3C DTCG)

{
  "color": {
    "cyan-900": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.0863, 0.3059, 0.3882],
        "hex": "#164e63"
      },
      "$description": "Tailwind CSS v3 cyan-900"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let cyan900 = Color(.sRGB, red: 0.086, green: 0.306, blue: 0.388, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Cyan900 = Color(0xFF164E63)
}

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 #164E63 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 cyan-900 #164E63

#164E63 color codes

Contrast: is #164E63 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 #164E63 live

Shades and tints of #164E63

Tailwind CSS v3 cyan scale

How vivid #164E63 can get

Mixing #164E63

#164E63 in an interface

How #164E63 looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #164E63

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 #164E63 in the tools