CSS named color

Turquoise #40E0D0

The CSS keyword turquoise is #40E0D0. It is a pale soft cyan in the cyan family. In OKLCH it sits at lightness 0.822, chroma 0.131 and hue 185.1°.

Relative luminance: 0.5896
OKLCH L · C · h: 0.822 · 0.131 · 185.1
Best text: Black 12.79:1
Hue family: Cyan

Inspect this color Check contrast

#40E0D0 color codes

HEX: #40E0D0
RGB: rgb(64, 224, 208)
HSL: hsl(174, 72%, 56%)
OKLCH: oklch(0.822 0.131 185.1)
OKLab: oklab(0.822 -0.130 -0.012)
CIELAB (D65): L* 81.26, a* -44.08, b* -4.03
XYZ (D65): X 40.15, Y 58.95, Z 68.92
CMYK (naive): cmyk(71%, 0%, 7%, 12%)

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 #40E0D0 accessible?

Black text on it reaches 12.79:1, passing AAA. White text fails at 1.64:1.

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

12.79:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +75
White text on it

1.64:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc −31
As text on black

12.79:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −74
As text on white

1.64:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc +28

Nearest versions that pass 4.5:1

For text on white

#00847A 4.58:1

Darkening its OKLCH lightness from 0.82 to 0.55 reaches 4.58:1 on white, keeping the hue.

Compare both in the Contrast System
For text on black

#40E0D0 12.79:1

It already reaches 12.79:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #40E0D0 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 #40E0D0

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #40E0D0 sits at step 300.

50#D7FFF9

White
1.07
Black
19.56
100#A5FFF3

White
1.15
Black
18.19
200#72F0E1

White
1.37
Black
15.26
300This color#40E0D0

White
1.64
Black
12.79
400#00BAAC

White
2.43
Black
8.61
500#009B8F

White
3.45
Black
6.08
600#008076

White
4.82
Black
4.34
700#00665E

White
6.85
Black
3.06
800#004B44

White
10.04
Black
2.08
900#00312C

White
14.23
Black
1.47
950#001B18

White
17.94
Black
1.16

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

Gamut

How vivid #40E0D0 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.145; #40E0D0 uses 90% of it. Display P3, which many recent phones and laptops show, reaches 0.196 there: 35% more.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.131
sRGB edge: 0.145
Display P3 edge: 0.196
Rec. 2020 edge: 0.314
Dominant wavelength: 495 nm
Excitation purity: 25%
Chromaticity: x 0.2390, y 0.3508

This color#40E0D0
Most vivid in sRGB#00E3D1
Most vivid in Display P3oklch(0.822 0.196 185.1)

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

Use the wider color where screens show it

.accent {
  color: #40e0d0;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0 0.9063 0.8362); }
}

Mixing

Mixing #40E0D0

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%#A0F0E8
OKLab50%#B1F0E7
OKLCH50%#B1F0E7

Black #000000

sRGB50%#207068
OKLab50%#13564F
OKLCH50%#13564F

Its complement #FFA8BC

sRGB50%#A0C4C6
OKLab50%#BCC8C6
OKLCH50%#B3C1FF

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #40e0d0, white);
color: color-mix(in oklch, #40e0d0 50%, white);

In use

#40E0D0 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, 4.5:112.79:1 Passes
Link and body-size textText, 4.5:11.64:1 Fails
Large headingLarge text, 3:11.64:1 Fails
Icons, borders and focus ringsNon-text, 3:11.64:1 Fails

For text on this page, the nearest shade that passes is #00847A 4.58:1

Dark page

Button labelText, 4.5:112.79:1 Passes
Link and body-size textText, 4.5:111.41:1 Passes
Large headingLarge text, 3:111.41:1 Passes
Icons, borders and focus ringsNon-text, 3:111.41:1 Passes

Color vision

How #40E0D0 looks with color blindness

Deuteranopia changes it most, ΔE2000 25.8; tritanopia changes it least, 2.7.

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

#D5D3D0 ΔE2000 25.0

Distinct

Reads as light gray
Deuteranopia

No working green (medium-wavelength) cones

#BEC3D2 ΔE2000 25.8

Distinct

Reads as light grayish blue
Tritanopia

No working blue (short-wavelength) cones

#00E5DB ΔE2000 2.7

Close match

Reads as pale soft cyan
Achromatopsia

No cone color vision; lightness only

#CACACA ΔE2000 24.4

Distinct

Reads as light gray

Pairing check

Checked against its complement, #FFA8BC. Their lightness contrast is only 1.10:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#40E0D0 · #FFA8BC	62.0	Stays distinct
Protanopia	#D5D3D0 · #B5B7BD	8.5	Harder to tell apart
Deuteranopia	#BEC3D2 · #CAC6BA	13.2	Stays distinct
Tritanopia	#00E5DB · #FFA2AF	57.8	Stays distinct
Achromatopsia	#CACACA · #C0C0C0	2.5	Easily confused

Harmony

Color harmonies for #40E0D0

Its complement is #FFA8BC, a pale soft pink, 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#40E0D0
Complement#FFA8BC

Complementary

Open in Harmony Studio

−30°#79DE9F
Base#40E0D0
+30°#40DAFA

Analogous

Open in Harmony Studio

Base#40E0D0
+120°#D6B2FF
+240°#FFB263

Triadic

Open in Harmony Studio

Base#40E0D0
+150°#F9A4E6
+210°#FFAD98

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-turquoise: #40e0d0;
}

Tailwind config

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        turquoise: '#40e0d0',
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  --color-turquoise: oklch(0.822 0.131 185.1);
}

Design token (W3C DTCG)

{
  "color": {
    "turquoise": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.251, 0.8784, 0.8157],
        "hex": "#40e0d0"
      },
      "$description": "CSS named color turquoise"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let turquoise = Color(.sRGB, red: 0.251, green: 0.878, blue: 0.816, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Turquoise = Color(0xFF40E0D0)
}

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 #40E0D0 in the tools

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

Turquoise #40E0D0

#40E0D0 color codes

Contrast: is #40E0D0 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 #40E0D0 live

Shades and tints of #40E0D0

How vivid #40E0D0 can get

Mixing #40E0D0

#40E0D0 in an interface

How #40E0D0 looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #40E0D0

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 #40E0D0 in the tools