Tailwind CSS v3 color

Tailwind stone-900 #1C1917

Tailwind CSS v3's stone-900 is #1C1917. It is a near-black in the neutral family. In OKLCH it sits at lightness 0.216 with chroma 0.006, too low for hue to matter. The nearest CSS named color is black (#000000), ΔE2000 5.9 away.

Relative luminance: 0.0100
OKLCH L · C · h: 0.216 · 0.006 · 56.0
Best text: White 17.48:1
Hue family: Neutral

Inspect this color Check contrast

#1C1917 color codes

HEX: #1C1917
RGB: rgb(28, 25, 23)
HSL: hsl(24, 10%, 10%)
OKLCH: oklch(0.216 0.006 56.0)
OKLab: oklab(0.216 0.003 0.005)
CIELAB (D65): L* 9.02, a* 1.00, b* 1.94
XYZ (D65): X 0.98, Y 1.00, Z 0.95
CMYK (naive): cmyk(0%, 11%, 18%, 89%)

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 #1C1917 accessible?

White text on it reaches 17.48:1, passing AAA. Black text fails at 1.20:1.

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

1.20:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.20:1
White text on it

17.48:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −106
As text on black

1.20:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.20:1
As text on white

17.48:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +104

Nearest versions that pass 4.5:1

For text on white

#1C1917 17.48:1

It already reaches 17.48:1 on white, so no change is needed.
For text on black

#787471 4.53:1

Lightening its OKLCH lightness from 0.22 to 0.56 reaches 4.53:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #1C1917 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 #1C1917

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #1C1917 sits at step 950.

50#F8F4F2

White
1.09
Black
19.21
100#EEEAE8

White
1.19
Black
17.56
200#DAD7D4

White
1.43
Black
14.65
300#C1BDBA

White
1.86
Black
11.25
400#A5A19E

White
2.56
Black
8.19
500#898583

White
3.65
Black
5.74
600#726E6B

White
5.05
Black
4.15
700#5B5755

White
7.14
Black
2.93
800#423F3D

White
10.44
Black
2.01
900#2B2826

White
14.64
Black
1.43
950This color#1C1917

White
17.48
Black
1.20

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

Tailwind CSS v3 stone scale

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

50#FAFAF9
White
1.04
Black
20.10
100#F5F5F4
White
1.09
Black
19.24
200#E7E5E4
White
1.25
Black
16.72
300#D6D3D1
White
1.48
Black
14.09
400#A8A29E
White
2.52
Black
8.32
500#78716C
White
4.79
Black
4.37
600#57534E
White
7.62
Black
2.75
700#44403C
White
10.27
Black
2.04
800#292524
White
15.16
Black
1.38
900This color#1C1917

White
17.48
Black
1.20
950#0C0A09
White
19.75
Black
1.06

Gamut

How vivid #1C1917 can get

A gray has no hue, so no gamut holds a more vivid version of #1C1917: more chroma would make it another color.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.006
sRGB edge: No hue
Display P3 edge: No hue
Rec. 2020 edge: No hue
Dominant wavelength: 584 nm
Excitation purity: 10%
Chromaticity: x 0.3340, y 0.3418

Mixing

Mixing #1C1917

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%#8E8C8B
OKLab50%#848281
OKLCH50%#848281

Black #000000

sRGB50%#0E0D0C
OKLab50%#050404
OKLCH50%#050404

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #1c1917, white);
color: color-mix(in oklch, #1c1917 50%, white);

In use

#1C1917 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, 4.5:117.48:1 Passes
Link and body-size textText, 4.5:117.48:1 Passes
Large headingLarge text, 3:117.48:1 Passes
Icons, borders and focus ringsNon-text, 3:117.48:1 Passes

Dark page

Button labelText, 4.5:117.48:1 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

For text on this page, the nearest shade that passes is #817D7A 4.59:1

Color vision

How #1C1917 looks with color blindness

As a neutral it barely changes under any simulation, ΔE2000 2.3 at most.

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

#1A1917 ΔE2000 1.5

Very close

Reads as near-black
Deuteranopia

No working green (medium-wavelength) cones

#1B1A17 ΔE2000 1.9

Very close

Reads as near-black
Tritanopia

No working blue (short-wavelength) cones

#1D1818 ΔE2000 2.3

Close match

Reads as near-black
Achromatopsia

No cone color vision; lightness only

#1A1A1A ΔE2000 2.3

Close match

Reads as near-black

Pairing check

A near-neutral has no complementary hue to pair with, so tell it apart from neighboring grays by lightness contrast alone.

Harmony

Color harmonies for #1C1917

A neutral has no hue to rotate, so every harmony collapses back to the same gray. Pair it with an accent color instead.

Or pair it by lightness: steps of its own scale as text on it, and what each can carry.

Build a lightness scale in Harmony Studio

Step 50 #F8F4F2 · 16.00:1

Body text, AAA
Step 300 #C1BDBA · 9.37:1

Body text, AAA
Step 700 #5B5755 · 2.44:1

Decoration only, under 3:1

Code

Design tokens

Ready-to-paste tokens in six formats. Rename them to fit your system.

CSS custom property

:root {
  --color-stone-900: #1c1917;
}

Tailwind config

// tailwind.config.js — already built in as stone-900;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        stone: { 900: '#1c1917' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own stone-900; this pins the v3 value. */
  --color-stone-900: oklch(0.216 0.006 56.0);
}

Design token (W3C DTCG)

{
  "color": {
    "stone-900": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.1098, 0.098, 0.0902],
        "hex": "#1c1917"
      },
      "$description": "Tailwind CSS v3 stone-900"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let stone900 = Color(.sRGB, red: 0.110, green: 0.098, blue: 0.090, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Stone900 = Color(0xFF1C1917)
}

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 #1C1917 in the tools

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