Tailwind CSS v3 color

Tailwind red-950 #450A0A

Tailwind CSS v3's red-950 is #450A0A. It is a very dark muted brown in the brown family. In OKLCH it sits at lightness 0.258, chroma 0.089 and hue 26.0°. The nearest CSS named color is maroon (#800000), ΔE2000 13.8 away.

Relative luminance: 0.0150
OKLCH L · C · h: 0.258 · 0.089 · 26.0
Best text: White 16.14:1
Hue family: Brown

Inspect this color Check contrast

#450A0A color codes

HEX: #450A0A
RGB: rgb(69, 10, 10)
HSL: hsl(0, 75%, 15%)
OKLCH: oklch(0.258 0.089 26.0)
OKLab: oklab(0.258 0.080 0.039)
CIELAB (D65): L* 12.64, a* 27.56, b* 15.50
XYZ (D65): X 2.62, Y 1.50, Z 0.44
CMYK (naive): cmyk(0%, 86%, 86%, 73%)

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 #450A0A accessible?

White text on it reaches 16.14:1, passing AAA. Black text fails at 1.30:1.

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

1.30:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.30:1
White text on it

16.14:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −105
As text on black

1.30:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.30:1
As text on white

16.14:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +102

Nearest versions that pass 4.5:1

For text on white

#450A0A 16.14:1

It already reaches 16.14:1 on white, so no change is needed.
For text on black

#A6635C 4.56:1

Lightening its OKLCH lightness from 0.26 to 0.57 reaches 4.56:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #450A0A 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 #450A0A

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #450A0A sits at step 900.

50#FFF2F0

White
1.09
Black
19.21
100#FFE4E1
White
1.20
Black
17.43
200#FFC8C2

White
1.46
Black
14.29
300#EFA9A2

White
1.93
Black
10.86
400#D28C85

White
2.68
Black
7.83
500#B6716A

White
3.77
Black
5.55
600#9B5A53

White
5.27
Black
3.98
700#81443E

White
7.42
Black
2.82
800#642C28

White
10.86
Black
1.93
900This color#450A0A

White
16.14
Black
1.30
950#2E0505

White
18.41
Black
1.14

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.

50#FEF2F2
White
1.09
Black
19.19
100#FEE2E2
White
1.22
Black
17.19
200#FECACA
White
1.44
Black
14.51
300#FCA5A5
White
1.89
Black
11.06
400#F87171
White
2.76
Black
7.59
500#EF4444
White
3.76
Black
5.58
600#DC2626
White
4.82
Black
4.34
700#B91C1C
White
6.47
Black
3.24
800#991B1B
White
8.31
Black
2.52
900#7F1D1D
White
10.01
Black
2.09
950This color#450A0A

White
16.14
Black
1.30

Gamut

How vivid #450A0A can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.105; #450A0A uses 84% of it. Display P3, which many recent phones and laptops show, reaches 0.119 there: 13% more.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.089
sRGB edge: 0.105
Display P3 edge: 0.119
Rec. 2020 edge: 0.130
Dominant wavelength: 611 nm
Excitation purity: 73%
Chromaticity: x 0.5738, y 0.3298

This color#450A0A
Most vivid in sRGB#4A0004
Most vivid in Display P3oklch(0.258 0.119 26.0)

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

Use the wider color where screens show it

.accent {
  color: #450a0a;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.2772 0 0.0129); }
}

Mixing

Mixing #450A0A

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%#A28585
OKLab50%#A27F7B
OKLCH50%#A27F7B

Black #000000

sRGB50%#230505
OKLab50%#150101
OKLCH50%#150101

Its complement #00292E

sRGB50%#231A1C
OKLab50%#2D1F1E
OKLCH50%#271B3F

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #450a0a, white);
color: color-mix(in oklch, #450a0a 50%, white);

In use

#450A0A 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, 4.5:116.14:1 Passes
Link and body-size textText, 4.5:116.14:1 Passes
Large headingLarge text, 3:116.14:1 Passes
Icons, borders and focus ringsNon-text, 3:116.14:1 Passes

Dark page

Button labelText, 4.5:116.14:1 Passes
Link and body-size textText, 4.5:11.16:1 Fails
Large headingLarge text, 3:11.16:1 Fails
Icons, borders and focus ringsNon-text, 3:11.16:1 Fails

For text on this page, the nearest shade that passes is #B06C65 4.62:1

Color vision

How #450A0A looks with color blindness

Deuteranopia changes it most, ΔE2000 24.5; tritanopia changes it least, 2.9.

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

#1C1909 ΔE2000 24.3

Distinct

Reads as very dark grayish brown
Deuteranopia

No working green (medium-wavelength) cones

#2B2508 ΔE2000 24.5

Distinct

Reads as very dark grayish brown
Tritanopia

No working blue (short-wavelength) cones

#4D000B ΔE2000 2.9

Close match

Reads as very dark soft brown
Achromatopsia

No cone color vision; lightness only

#212121 ΔE2000 21.5

Distinct

Reads as near-black

Pairing check

Checked against its complement, #00292E. 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	#450A0A · #00292E	39.0	Stays distinct
Protanopia	#1C1909 · #24272E	13.8	Stays distinct
Deuteranopia	#2B2508 · #1E222E	21.6	Stays distinct
Tritanopia	#4D000B · #002C2A	40.0	Stays distinct
Achromatopsia	#212121 · #242424	0.9	Easily confused

Harmony

Color harmonies for #450A0A

Its complement is #00292E, a very dark grayish 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#450A0A
Complement#00292E

Complementary

Open in Harmony Studio

−30°#420A25
Base#450A0A
+30°#3A1A00

Analogous

Open in Harmony Studio

Base#450A0A
+120°#002D08
+240°#0F1F4D

Triadic

Open in Harmony Studio

Base#450A0A
+150°#002B22
+210°#00273B

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-950: #450a0a;
}

Tailwind config

// tailwind.config.js — already built in as red-950;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        red: { 950: '#450a0a' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own red-950; this pins the v3 value. */
  --color-red-950: oklch(0.258 0.089 26.0);
}

Design token (W3C DTCG)

{
  "color": {
    "red-950": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.2706, 0.0392, 0.0392],
        "hex": "#450a0a"
      },
      "$description": "Tailwind CSS v3 red-950"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let red950 = Color(.sRGB, red: 0.271, green: 0.039, blue: 0.039, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Red950 = Color(0xFF450A0A)
}

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 #450A0A 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 red-950 #450A0A

#450A0A color codes

Contrast: is #450A0A 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 #450A0A live

Shades and tints of #450A0A

Tailwind CSS v3 red scale

How vivid #450A0A can get

Mixing #450A0A

#450A0A in an interface

How #450A0A looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #450A0A

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 #450A0A in the tools