Tailwind CSS v3 color
Tailwind red-600 #DC2626
Tailwind CSS v3's red-600 is #DC2626. It is a vivid red in the red family. In OKLCH it sits at lightness 0.577, chroma 0.215 and hue 27.3°. The nearest CSS named color is crimson (#DC143C), ΔE2000 7.0 away.
- Relative luminance
- 0.1674
- OKLCH L · C · h
- 0.577 · 0.215 · 27.3
- Best text
- White 4.82:1
- Hue family
- Red
#DC2626 color codes
- HEX
#DC2626- RGB
rgb(220, 38, 38)- HSL
hsl(0, 72%, 51%)- OKLCH
oklch(0.577 0.215 27.3)- OKLab
oklab(0.577 0.191 0.099)- CIELAB (D65)
L* 47.94, a* 66.94, b* 46.91- XYZ (D65)
X 30.56, Y 16.75, Z 3.46- CMYK (naive)
cmyk(0%, 83%, 83%, 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 #DC2626 accessible?
White text on it reaches 4.82:1, passing AA. Black text manages only 4.34:1, 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
4.34:1
- AA fails
- AA large passes
- AAA fails
- APCA Lc +32
-
White text on it
4.82:1
- AA passes
- AA large passes
- AAA fails
- APCA Lc −77
-
As text on black
4.34:1
- AA fails
- AA large passes
- AAA fails
- APCA Lc −30
-
As text on white
4.82:1
- AA passes
- AA large passes
- AAA fails
- APCA Lc +71
Nearest versions that pass 4.5:1
-
For text on white
#DC2626 4.82:1
It already reaches 4.82:1 on white, so no change is needed.
-
For text on black
#E02B29 4.54:1
Lightening its OKLCH lightness from 0.58 to 0.59 reaches 4.54:1 on black, keeping the hue.
Checking another pair? Use the Contrast Checker.
Studio
Adjust #DC2626 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.
Scale
Shades and tints of #DC2626
Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #DC2626 sits at step 600.
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.
Gamut
How vivid #DC2626 can get
At its lightness and hue, sRGB reaches OKLCH chroma 0.236; #DC2626 uses 91% of it. Display P3, which many recent phones and laptops show, reaches 0.265 there: 13% more.
- sRGB
- Display P3
- Rec. 2020
- Dominant wavelength
- OKLCH chroma
- 0.215
- sRGB edge
- 0.236
- Display P3 edge
- 0.265
- Rec. 2020 edge
- 0.278
- Dominant wavelength
- 611 nm
- Excitation purity
- 81%
- Chromaticity
- x 0.6020, y 0.3299
- This color#DC2626
- Most vivid in sRGB#E40016
- Most vivid in Display P3oklch(0.577 0.265 27.3)
On a screen without Display P3 the last tile shows the sRGB edge instead.
.accent {
color: #dc2626;
}
@media (color-gamut: p3) {
.accent { color: color(display-p3 0.8556 0 0.0739); }
}Mixing
Mixing #DC2626
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%#EE9393
- OKLab50%#F89F94
- OKLCH50%#F89F94
Black #000000
- sRGB50%#6E1313
- OKLab50%#540808
- OKLCH50%#540808
Its complement #008997
- sRGB50%#6E585F
- OKLab50%#996C67
- OKLCH50%#8560C9
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #dc2626, white);
color: color-mix(in oklch, #dc2626 50%, white);In use
#DC2626 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, 4.5:14.82:1 Passes
- Link and body-size textText, 4.5:14.82:1 Passes
- Large headingLarge text, 3:14.82:1 Passes
- Icons, borders and focus ringsNon-text, 3:14.82:1 Passes
Dark page
- Button labelText, 4.5:14.82:1 Passes
- Link and body-size textText, 4.5:13.87:1 Fails
- Large headingLarge text, 3:13.87:1 Passes
- Icons, borders and focus ringsNon-text, 3:13.87:1 Passes
For text on this page, the nearest shade that passes is #EB3833 4.59:1
Color vision
How #DC2626 looks with color blindness
Deuteranopia changes it most, ΔE2000 42.3; tritanopia changes it least, 4.2.
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
#635923 ΔE2000 38.3
Distinct
Reads as dark muted brown
-
Deuteranopia
No working green (medium-wavelength) cones
#8F801B ΔE2000 42.3
Distinct
Reads as soft yellow
-
Tritanopia
No working blue (short-wavelength) cones
#F3002A ΔE2000 4.2
Close match
Reads as vivid red
-
Achromatopsia
No cone color vision; lightness only
#727272 ΔE2000 28.8
Distinct
Reads as gray
Pairing check
Checked against its complement, #008997. Their lightness contrast is only 1.15:1, so where hue collapses, add a label, icon or pattern.
| Vision | The pair | ΔE2000 | Verdict |
|---|---|---|---|
| Normal vision | #DC2626 · #008997 | 52.6 | Stays distinct |
| Protanopia | #635923 · #7C8398 | 34.7 | Stays distinct |
| Deuteranopia | #8F801B · #6A7797 | 40.8 | Stays distinct |
| Tritanopia | #F3002A · #00908D | 59.9 | Stays distinct |
| Achromatopsia | #727272 · #7C7C7C | 4.0 | Easily confused |
Harmony
Color harmonies for #DC2626
Its complement is #008997, 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#DC2626
- Complement#008997
Complementary
Open in Harmony Studio- −30°#D3247A
- Base#DC2626
- +30°#B56000
Analogous
Open in Harmony Studio- Base#DC2626
- +120°#009336
- +240°#4269F6
Triadic
Open in Harmony Studio- Base#DC2626
- +150°#008E79
- +210°#0083BB
Split-complementary
Open in Harmony StudioCode
Design tokens
Ready-to-paste tokens in six formats. Rename them to fit your system.
:root {
--color-red-600: #dc2626;
}// tailwind.config.js — already built in as red-600;
// pin the v3 value explicitly like this:
module.exports = {
theme: {
extend: {
colors: {
red: { 600: '#dc2626' },
},
},
},
};/* app.css — Tailwind CSS v4 */
@import "tailwindcss";
@theme {
/* v4 has its own red-600; this pins the v3 value. */
--color-red-600: oklch(0.577 0.215 27.3);
}{
"color": {
"red-600": {
"$type": "color",
"$value": {
"colorSpace": "srgb",
"components": [0.8627, 0.149, 0.149],
"hex": "#dc2626"
},
"$description": "Tailwind CSS v3 red-600"
}
}
}import SwiftUI
enum Palette {
static let red600 = Color(.sRGB, red: 0.863, green: 0.149, blue: 0.149, opacity: 1)
}import androidx.compose.ui.graphics.Color
object Palette {
val Red600 = Color(0xFFDC2626)
}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 #DC2626 in the tools
Each opens over this page. More colors live in the Color Library, and every color page is listed on the hub.
- Color InspectorEvery format, its names, contrast and color vision in one panel.
- Contrast SystemBlack and white text on this color, with fixes in both directions.
- Harmony StudioPalettes built from this color, walked to a contrast target if you ask.
- Color Space ConverterThe same color in 34 notations, with its gamut headroom.
- Color Name FinderThe nearest of 1,055 color names by ΔE2000.