Tailwind CSS v3 color

Tailwind slate-950 #020617

Tailwind CSS v3's slate-950 is #020617. It is a very dark grayish blue in the blue family. In OKLCH it sits at lightness 0.129, chroma 0.041 and hue 264.7°. The nearest CSS named color is black (#000000), ΔE2000 7.8 away.

Relative luminance: 0.0021
OKLCH L · C · h: 0.129 · 0.041 · 264.7
Best text: White 20.17:1
Hue family: Blue

Inspect this color Check contrast

#020617 color codes

HEX: #020617
RGB: rgb(2, 6, 23)
HSL: hsl(229, 84%, 5%)
OKLCH: oklch(0.129 0.041 264.7)
OKLab: oklab(0.129 -0.004 -0.040)
CIELAB (D65): L* 1.85, a* 2.04, b* -8.78
XYZ (D65): X 0.24, Y 0.20, Z 0.84
CMYK (naive): cmyk(91%, 74%, 0%, 91%)

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 #020617 accessible?

White text on it reaches 20.17:1, passing AAA. Black text fails at 1.04:1.

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

1.04:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.04:1
White text on it

20.17:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −107
As text on black

1.04:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.04:1
As text on white

20.17:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +105

Nearest versions that pass 4.5:1

For text on white

#020617 20.17:1

It already reaches 20.17:1 on white, so no change is needed.
For text on black

#6A768E 4.59:1

Lightening its OKLCH lightness from 0.13 to 0.56 reaches 4.59:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #020617 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 #020617

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #020617 sits at step 950.

50#F0F5FF

White
1.09
Black
19.21
100#E2EBFF

White
1.19
Black
17.56
200#CCD8F0

White
1.43
Black
14.64
300#B2BED7

White
1.86
Black
11.23
400#95A2BB

White
2.57
Black
8.16
500#7A869F

White
3.65
Black
5.73
600#636F87

White
5.05
Black
4.15
700#4D586F

White
7.14
Black
2.94
800#364054

White
10.40
Black
2.01
900#20293A

White
14.58
Black
1.43
950This color#020617

White
20.17
Black
1.04

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

Tailwind CSS v3 slate scale

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

50#F8FAFC
White
1.04
Black
20.07
100#F1F5F9
White
1.09
Black
19.16
200#E2E8F0
White
1.23
Black
17.03
300#CBD5E1
White
1.48
Black
14.14
400#94A3B8
White
2.56
Black
8.19
500#64748B
White
4.75
Black
4.41
600#475569
White
7.57
Black
2.77
700#334155
White
10.35
Black
2.02
800#1E293B
White
14.62
Black
1.43
900#0F172A
White
17.85
Black
1.17
950This color#020617

White
20.17
Black
1.04

Gamut

How vivid #020617 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.090; #020617 uses 45% of it. Display P3 reaches no further at this hue.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.041
sRGB edge: 0.090
Display P3 edge: 0.091
Rec. 2020 edge: 0.096
Dominant wavelength: 471 nm
Excitation purity: 64%
Chromaticity: x 0.1902, y 0.1593

This color#020617
Most vivid in sRGB#00002A
Most vivid in Display P3oklch(0.129 0.091 264.7)

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

Use the wider color where screens show it

.accent {
  color: #020617;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.0006 0 0.1581); }
}

Mixing

Mixing #020617

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%#81838B
OKLab50%#707682
OKLCH50%#707682

Black #000000

sRGB50%#01030C
OKLab50%#000104
OKLCH50%#000104

Its complement #0C0600

sRGB50%#07060C
OKLab50%#06070A
OKLCH50%#110308

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #020617, white);
color: color-mix(in oklch, #020617 50%, white);

In use

#020617 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, 4.5:120.17:1 Passes
Link and body-size textText, 4.5:120.17:1 Passes
Large headingLarge text, 3:120.17:1 Passes
Icons, borders and focus ringsNon-text, 3:120.17:1 Passes

Dark page

Button labelText, 4.5:120.17:1 Passes
Link and body-size textText, 4.5:11.07:1 Fails
Large headingLarge text, 3:11.07:1 Fails
Icons, borders and focus ringsNon-text, 3:11.07:1 Fails

Color vision

How #020617 looks with color blindness

Tritanopia changes it most, ΔE2000 7.7; deuteranopia changes it least, 0.8.

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

#010818 ΔE2000 1.2

Very close

Reads as very dark grayish blue
Deuteranopia

No working green (medium-wavelength) cones

#000617 ΔE2000 0.8

Imperceptible

Reads as very dark grayish blue
Tritanopia

No working blue (short-wavelength) cones

#000A0D ΔE2000 7.7

Noticeable

Reads as very dark grayish teal
Achromatopsia

No cone color vision; lightness only

#070707 ΔE2000 7.7

Noticeable

Reads as near-black

Pairing check

Checked against its complement, #0C0600. Their lightness contrast is only 1.00:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#020617 · #0C0600	10.1	Stays distinct
Protanopia	#010818 · #080600	10.2	Stays distinct
Deuteranopia	#000617 · #0A0700	10.6	Stays distinct
Tritanopia	#000A0D · #0E0504	7.4	Harder to tell apart
Achromatopsia	#070707 · #070707	0.0	Easily confused

Harmony

Color harmonies for #020617

Its complement is #0C0600, a very dark grayish brown.

Hue rotations in OKLCH, mapped into sRGB by trimming chroma so hue and lightness stay put.

Open the Harmony Studio

Base#020617
Complement#0C0600

Complementary

Open in Harmony Studio

−30°#000811
Base#020617
+30°#080415

Analogous

Open in Harmony Studio

Base#020617
+120°#140202
+240°#000B01

Triadic

Open in Harmony Studio

Base#020617
+150°#110400
+210°#070800

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-slate-950: #020617;
}

Tailwind config

// tailwind.config.js — already built in as slate-950;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        slate: { 950: '#020617' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own slate-950; this pins the v3 value. */
  --color-slate-950: oklch(0.129 0.041 264.7);
}

Design token (W3C DTCG)

{
  "color": {
    "slate-950": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.0078, 0.0235, 0.0902],
        "hex": "#020617"
      },
      "$description": "Tailwind CSS v3 slate-950"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let slate950 = Color(.sRGB, red: 0.008, green: 0.024, blue: 0.090, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Slate950 = Color(0xFF020617)
}

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 #020617 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 slate-950 #020617

#020617 color codes

Contrast: is #020617 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 #020617 live

Shades and tints of #020617

Tailwind CSS v3 slate scale

How vivid #020617 can get

Mixing #020617

#020617 in an interface

How #020617 looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #020617

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 #020617 in the tools