Tailwind CSS v3 color

Tailwind emerald-900 #064E3B

Tailwind CSS v3's emerald-900 is #064E3B. It is a dark muted green in the green family. In OKLCH it sits at lightness 0.378, chroma 0.073 and hue 168.9°. The nearest CSS named color is darkslategray (#2F4F4F), ΔE2000 11.2 away.

Relative luminance: 0.0580
OKLCH L · C · h: 0.378 · 0.073 · 168.9
Best text: White 9.71:1
Hue family: Green

Inspect this color Check contrast

#064E3B color codes

HEX: #064E3B
RGB: rgb(6, 78, 59)
HSL: hsl(164, 86%, 16%)
OKLCH: oklch(0.378 0.073 168.9)
OKLab: oklab(0.378 -0.072 0.014)
CIELAB (D65): L* 28.91, a* -25.84, b* 5.49
XYZ (D65): X 3.59, Y 5.80, Z 5.07
CMYK (naive): cmyk(92%, 0%, 24%, 69%)

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 #064E3B accessible?

White text on it reaches 9.71:1, passing AAA. Black text fails at 2.16:1.

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

2.16:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc +11
White text on it

9.71:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −96
As text on black

2.16:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc −10
As text on white

9.71:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +92

Nearest versions that pass 4.5:1

For text on white

#064E3B 9.71:1

It already reaches 9.71:1 on white, so no change is needed.
For text on black

#43806B 4.53:1

Lightening its OKLCH lightness from 0.38 to 0.55 reaches 4.53:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #064E3B 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 #064E3B

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #064E3B sits at step 800.

50#DAFFF0

White
1.07
Black
19.54
100#C5F9E4

White
1.16
Black
18.04
200#AEE6D0

White
1.39
Black
15.02
300#92CCB6

White
1.82
Black
11.53
400#73B09A

White
2.49
Black
8.40
500#57957E

White
3.49
Black
6.00
600#3F7C67

White
4.89
Black
4.29
700#286551

White
6.83
Black
3.07
800This color#064E3B

White
9.71
Black
2.16
900#003224

White
14.17
Black
1.48
950#001C13

White
17.86
Black
1.17

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

Tailwind CSS v3 emerald scale

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

50#ECFDF5
White
1.05
Black
19.93
100#D1FAE5
White
1.13
Black
18.51
200#A7F3D0
White
1.28
Black
16.37
300#6EE7B7
White
1.52
Black
13.77
400#34D399
White
1.92
Black
10.92
500#10B981
White
2.53
Black
8.27
600#059669
White
3.76
Black
5.57
700#047857
White
5.48
Black
3.82
800#065F46
White
7.68
Black
2.73
900This color#064E3B

White
9.71
Black
2.16
950#022C22
White
15.15
Black
1.38

Gamut

How vivid #064E3B can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.076; #064E3B uses 96% of it. Display P3, which many recent phones and laptops show, reaches 0.104 there: 37% more.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.073
sRGB edge: 0.076
Display P3 edge: 0.104
Rec. 2020 edge: 0.164
Dominant wavelength: 506 nm
Excitation purity: 21%
Chromaticity: x 0.2482, y 0.4013

This color#064E3B
Most vivid in sRGB#004E3B
Most vivid in Display P3oklch(0.378 0.104 168.9)

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

Use the wider color where screens show it

.accent {
  color: #064e3b;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0 0.3163 0.2261); }
}

Mixing

Mixing #064E3B

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%#83A79D
OKLab50%#86A397
OKLCH50%#86A397

Black #000000

sRGB50%#03271E
OKLab50%#011911
OKLCH50%#011911

Its complement #5E3148

sRGB50%#324042
OKLab50%#424242
OKLCH50%#563D0A

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #064e3b, white);
color: color-mix(in oklch, #064e3b 50%, white);

In use

#064E3B 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, 4.5:19.71:1 Passes
Link and body-size textText, 4.5:19.71:1 Passes
Large headingLarge text, 3:19.71:1 Passes
Icons, borders and focus ringsNon-text, 3:19.71:1 Passes

Dark page

Button labelText, 4.5:19.71:1 Passes
Link and body-size textText, 4.5:11.92:1 Fails
Large headingLarge text, 3:11.92:1 Fails
Icons, borders and focus ringsNon-text, 3:11.92:1 Fails

For text on this page, the nearest shade that passes is #4A8872 4.51:1

Color vision

How #064E3B looks with color blindness

Achromatopsia changes it most, ΔE2000 20.4; tritanopia changes it least, 5.8.

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

#4C483A ΔE2000 19.7

Distinct

Reads as dark grayish brown
Deuteranopia

No working green (medium-wavelength) cones

#43423C ΔE2000 19.4

Distinct

Reads as dark gray
Tritanopia

No working blue (short-wavelength) cones

#004F49 ΔE2000 5.8

Noticeable

Reads as dark muted teal
Achromatopsia

No cone color vision; lightness only

#444444 ΔE2000 20.4

Distinct

Reads as dark gray

Pairing check

Checked against its complement, #5E3148. Their lightness contrast is only 1.07:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#064E3B · #5E3148	39.7	Stays distinct
Protanopia	#4C483A · #353B49	16.7	Stays distinct
Deuteranopia	#43423C · #414247	7.0	Harder to tell apart
Tritanopia	#004F49 · #643039	43.3	Stays distinct
Achromatopsia	#444444 · #3F3F3F	1.7	Easily confused

Harmony

Color harmonies for #064E3B

Its complement is #5E3148, a dark muted wine, 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#064E3B
Complement#5E3148

Complementary

Open in Harmony Studio

−30°#2D4B24
Base#064E3B
+30°#004C4F

Analogous

Open in Harmony Studio

Base#064E3B
+120°#413B66
+240°#61351C

Triadic

Open in Harmony Studio

Base#064E3B
+150°#52345A
+210°#633032

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-emerald-900: #064e3b;
}

Tailwind config

// tailwind.config.js — already built in as emerald-900;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        emerald: { 900: '#064e3b' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own emerald-900; this pins the v3 value. */
  --color-emerald-900: oklch(0.378 0.073 168.9);
}

Design token (W3C DTCG)

{
  "color": {
    "emerald-900": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.0235, 0.3059, 0.2314],
        "hex": "#064e3b"
      },
      "$description": "Tailwind CSS v3 emerald-900"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let emerald900 = Color(.sRGB, red: 0.024, green: 0.306, blue: 0.231, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Emerald900 = Color(0xFF064E3B)
}

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 #064E3B 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 emerald-900 #064E3B

#064E3B color codes

Contrast: is #064E3B 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 #064E3B live

Shades and tints of #064E3B

Tailwind CSS v3 emerald scale

How vivid #064E3B can get

Mixing #064E3B

#064E3B in an interface

How #064E3B looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #064E3B

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 #064E3B in the tools