CSS named color

Crimson #DC143C

The CSS keyword crimson is #DC143C. It is a vivid red in the red family. In OKLCH it sits at lightness 0.571, chroma 0.222 and hue 20.1°.

Relative luminance: 0.1604
OKLCH L · C · h: 0.571 · 0.222 · 20.1
Best text: White 4.98:1
Hue family: Red

Inspect this color Check contrast

#DC143C color codes

HEX: #DC143C
RGB: rgb(220, 20, 60)
HSL: hsl(348, 83%, 47%)
OKLCH: oklch(0.571 0.222 20.1)
OKLab: oklab(0.571 0.208 0.076)
CIELAB (D65): L* 47.04, a* 70.92, b* 33.60
XYZ (D65): X 30.58, Y 16.05, Z 5.76
CMYK (naive): cmyk(0%, 91%, 73%, 14%)

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 #DC143C accessible?

White text on it reaches 4.98:1, passing AA. Black text manages only 4.20:1, enough for large text only.

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

4.20:1
- AA fails
- AA large passes
- AAA fails
- APCA Lc +31
White text on it

4.98:1
- AA passes
- AA large passes
- AAA fails
- APCA Lc −77
As text on black

4.20:1
- AA fails
- AA large passes
- AAA fails
- APCA Lc −29
As text on white

4.98:1
- AA passes
- AA large passes
- AAA fails
- APCA Lc +72

Nearest versions that pass 4.5:1

For text on white

#DC143C 4.98:1

It already reaches 4.98:1 on white, so no change is needed.
For text on black

#E32142 4.56:1

Lightening its OKLCH lightness from 0.57 to 0.59 reaches 4.56:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #DC143C 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 #DC143C

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #DC143C sits at step 600.

50#FFF1F1

White
1.09
Black
19.10
100#FFE4E3

White
1.20
Black
17.45
200#FFC8C6

White
1.46
Black
14.32
300#FF9F9F

White
1.96
Black
10.71
400#FF6970

White
2.79
Black
7.50
500#EE304A

White
4.07
Black
5.15
600This color#DC143C

White
4.98
Black
4.20
700#A70028

White
7.85
Black
2.67
800#7C001B

White
11.21
Black
1.87
900#53000F

White
15.27
Black
1.37
950#320006

White
18.44
Black
1.13

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

Gamut

How vivid #DC143C can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.230; #DC143C uses 97% of it. Display P3, which many recent phones and laptops show, reaches 0.259 there: 13% more.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.222
sRGB edge: 0.230
Display P3 edge: 0.259
Rec. 2020 edge: 0.302
Dominant wavelength: 627 nm
Excitation purity: 69%
Chromaticity: x 0.5838, y 0.3063

This color#DC143C
Most vivid in sRGB#DF0039
Most vivid in Display P3oklch(0.571 0.259 20.1)

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

Use the wider color where screens show it

.accent {
  color: #dc143c;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.8371 0 0.2138); }
}

Mixing

Mixing #DC143C

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%#EE8A9E
OKLab50%#F89C9B
OKLCH50%#F89C9B

Black #000000

sRGB50%#6E0A1E
OKLab50%#540311
OKLCH50%#540311

Its complement #00888E

sRGB50%#6E4E65
OKLab50%#996968
OKLCH50%#7962CD

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #dc143c, white);
color: color-mix(in oklch, #dc143c 50%, white);

In use

#DC143C 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, 4.5:14.98:1 Passes
Link and body-size textText, 4.5:14.98:1 Passes
Large headingLarge text, 3:14.98:1 Passes
Icons, borders and focus ringsNon-text, 3:14.98:1 Passes

Dark page

Button labelText, 4.5:14.98:1 Passes
Link and body-size textText, 4.5:13.75:1 Fails
Large headingLarge text, 3:13.75:1 Passes
Icons, borders and focus ringsNon-text, 3:13.75:1 Passes

For text on this page, the nearest shade that passes is #ED2E49 4.53:1

Color vision

How #DC143C looks with color blindness

Deuteranopia changes it most, ΔE2000 44.1; tritanopia changes it least, 7.0.

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

#5C553B ΔE2000 36.3

Distinct

Reads as dark grayish brown
Deuteranopia

No working green (medium-wavelength) cones

#8B7E35 ΔE2000 44.1

Distinct

Reads as muted amber
Tritanopia

No working blue (short-wavelength) cones

#F20029 ΔE2000 7.0

Noticeable

Reads as vivid red
Achromatopsia

No cone color vision; lightness only

#6F6F6F ΔE2000 28.5

Distinct

Reads as gray

Pairing check

Checked against its complement, #00888E. Their lightness contrast is only 1.16:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#DC143C · #00888E	56.5	Stays distinct
Protanopia	#5C553B · #7D818F	26.3	Stays distinct
Deuteranopia	#8B7E35 · #6C758F	35.7	Stays distinct
Tritanopia	#F20029 · #008E8A	60.0	Stays distinct
Achromatopsia	#6F6F6F · #7A7A7A	4.4	Easily confused

Harmony

Color harmonies for #DC143C

Its complement is #00888E, a muted cyan, on the cool 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#DC143C
Complement#00888E

Complementary

Open in Harmony Studio

−30°#CE1F89
Base#DC143C
+30°#BB5700

Analogous

Open in Harmony Studio

Base#DC143C
+120°#299000
+240°#126DF7

Triadic

Open in Harmony Studio

Base#DC143C
+150°#008D6E
+210°#0083AE

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-crimson: #dc143c;
}

Tailwind config

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        crimson: '#dc143c',
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  --color-crimson: oklch(0.571 0.222 20.1);
}

Design token (W3C DTCG)

{
  "color": {
    "crimson": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.8627, 0.0784, 0.2353],
        "hex": "#dc143c"
      },
      "$description": "CSS named color crimson"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let crimson = Color(.sRGB, red: 0.863, green: 0.078, blue: 0.235, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Crimson = Color(0xFFDC143C)
}

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 #DC143C in the tools

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

Crimson #DC143C

#DC143C color codes

Contrast: is #DC143C 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 #DC143C live

Shades and tints of #DC143C

How vivid #DC143C can get

Mixing #DC143C

#DC143C in an interface

How #DC143C looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #DC143C

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 #DC143C in the tools