Tailwind CSS v3 color

Tailwind red-900 #7F1D1D

Tailwind CSS v3's red-900 is #7F1D1D. It is a dark soft brown in the brown family. In OKLCH it sits at lightness 0.396, chroma 0.133 and hue 25.7°. The nearest CSS named color is maroon (#800000), ΔE2000 5.6 away.

Relative luminance
0.0548
OKLCH L · C · h
0.396 · 0.133 · 25.7
Best text
White 10.01:1
Hue family
Brown
Inspect this color Check contrast

#7F1D1D color codes

HEX
#7F1D1D
RGB
rgb(127, 29, 29)
HSL
hsl(0, 63%, 31%)
OKLCH
oklch(0.396 0.133 25.7)
OKLab
oklab(0.396 0.120 0.058)
CIELAB (D65)
L* 28.06, a* 41.42, b* 25.75
XYZ (D65)
X 9.41, Y 5.48, Z 1.72
CMYK (naive)
cmyk(0%, 77%, 77%, 50%)

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 #7F1D1D accessible?

White text on it reaches 10.01:1, passing AAA. Black text fails at 2.09:1.

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

    2.09:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc +11

  • White text on it

    10.01:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −96

  • As text on black

    2.09:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc −10

  • As text on white

    10.01:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc +92

Nearest versions that pass 4.5:1

  • For text on white

    #7F1D1D 10.01:1

    It already reaches 10.01:1 on white, so no change is needed.

  • For text on black

    #BB554F 4.52:1

    Lightening its OKLCH lightness from 0.40 to 0.58 reaches 4.52:1 on black, keeping the hue.

    Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #7F1D1D 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 #7F1D1D

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #7F1D1D sits at step 800.

  1. 50#FFF2F0
    White
    1.09
    Black
    19.21
  2. 100#FFE4E1
    White
    1.20
    Black
    17.43
  3. 200#FFC8C2
    White
    1.46
    Black
    14.29
  4. 300#FFA097
    White
    1.95
    Black
    10.72
  5. 400#E87F76
    White
    2.71
    Black
    7.72
  6. 500#CA625B
    White
    3.88
    Black
    5.40
  7. 600#AE4A45
    White
    5.43
    Black
    3.86
  8. 700#933430
    White
    7.56
    Black
    2.77
  9. 800This color#7F1D1D
    White
    10.01
    Black
    2.09
  10. 900#530106
    White
    15.27
    Black
    1.37
  11. 950#320002
    White
    18.47
    Black
    1.13

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

Tailwind CSS v3 red scale

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

  1. 50#FEF2F2
    White
    1.09
    Black
    19.19
  2. 100#FEE2E2
    White
    1.22
    Black
    17.19
  3. 200#FECACA
    White
    1.44
    Black
    14.51
  4. 300#FCA5A5
    White
    1.89
    Black
    11.06
  5. 400#F87171
    White
    2.76
    Black
    7.59
  6. 500#EF4444
    White
    3.76
    Black
    5.58
  7. 600#DC2626
    White
    4.82
    Black
    4.34
  8. 700#B91C1C
    White
    6.47
    Black
    3.24
  9. 800#991B1B
    White
    8.31
    Black
    2.52
  10. 900This color#7F1D1D
    White
    10.01
    Black
    2.09
  11. 950#450A0A
    White
    16.14
    Black
    1.30

Gamut

How vivid #7F1D1D can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.161; #7F1D1D uses 83% of it. Display P3, which many recent phones and laptops show, reaches 0.181 there: 13% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.133
sRGB edge
0.161
Display P3 edge
0.181
Rec. 2020 edge
0.200
Dominant wavelength
611 nm
Excitation purity
71%
Chromaticity
x 0.5665, y 0.3298
  • This color#7F1D1D
  • Most vivid in sRGB#89000F
  • Most vivid in Display P3oklch(0.396 0.181 25.7)

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

Use the wider color where screens show it
.accent {
  color: #7f1d1d;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.5127 0 0.0527); }
}

Mixing

Mixing #7F1D1D

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%#BF8E8E
  • OKLab50%#C48E88
  • OKLCH50%#C48E88

Black #000000

  • sRGB50%#400F0F
  • OKLab50%#2D0505
  • OKLCH50%#2D0505

Its complement #005158

  • sRGB50%#40373B
  • OKLab50%#57403D
  • OKLCH50%#454C00
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #7f1d1d, white);
color: color-mix(in oklch, #7f1d1d 50%, white);

In use

#7F1D1D 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, 4.5:110.01:1 Passes
  • Link and body-size textText, 4.5:110.01:1 Passes
  • Large headingLarge text, 3:110.01:1 Passes
  • Icons, borders and focus ringsNon-text, 3:110.01:1 Passes

Dark page

  • Button labelText, 4.5:110.01:1 Passes
  • Link and body-size textText, 4.5:11.86:1 Fails
  • Large headingLarge text, 3:11.86:1 Fails
  • Icons, borders and focus ringsNon-text, 3:11.86:1 Fails

For text on this page, the nearest shade that passes is #C55E57 4.56:1

Color vision

How #7F1D1D looks with color blindness

Deuteranopia changes it most, ΔE2000 30.9; tritanopia changes it least, 3.9.

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

    #3A351C ΔE2000 28.1

    Distinct

    Reads as dark grayish brown

  • Deuteranopia

    No working green (medium-wavelength) cones

    #534A19 ΔE2000 30.9

    Distinct

    Reads as dark muted brown

  • Tritanopia

    No working blue (short-wavelength) cones

    #8C001E ΔE2000 3.9

    Close match

    Reads as dark soft red

  • Achromatopsia

    No cone color vision; lightness only

    #424242 ΔE2000 24.5

    Distinct

    Reads as dark gray

Pairing check

Checked against its complement, #005158. Their lightness contrast is only 1.10:1, so where hue collapses, add a label, icon or pattern.

VisionThe pairΔE2000Verdict
Normal vision#7F1D1D · #00515842.7Stays distinct
Protanopia#3A351C · #494D5820.9Stays distinct
Deuteranopia#534A19 · #3E455829.8Stays distinct
Tritanopia#8C001E · #00555349.1Stays distinct
Achromatopsia#424242 · #4949492.3Easily confused

Harmony

Color harmonies for #7F1D1D

Its complement is #005158, a dark muted teal, 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#7F1D1D
  • Complement#005158

Complementary

Open in Harmony Studio
  • −30°#791C49
  • Base#7F1D1D
  • +30°#6D3600

Analogous

Open in Harmony Studio
  • Base#7F1D1D
  • +120°#005716
  • +240°#243F8D

Triadic

Open in Harmony Studio
  • Base#7F1D1D
  • +150°#005345
  • +210°#004D6E

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-red-900: #7f1d1d;
}

Tailwind config

// tailwind.config.js — already built in as red-900;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        red: { 900: '#7f1d1d' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own red-900; this pins the v3 value. */
  --color-red-900: oklch(0.396 0.133 25.7);
}

Design token (W3C DTCG)

{
  "color": {
    "red-900": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.498, 0.1137, 0.1137],
        "hex": "#7f1d1d"
      },
      "$description": "Tailwind CSS v3 red-900"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let red900 = Color(.sRGB, red: 0.498, green: 0.114, blue: 0.114, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Red900 = Color(0xFF7F1D1D)
}

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.

Neighbors

The eight nearest colors on this site by ΔE2000, closest first. Under 2 is hard to tell apart side by side.

Tools

Open #7F1D1D in the tools

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