Tailwind CSS v3 color

Tailwind gray-800 #1F2937

Tailwind CSS v3's gray-800 is #1F2937. It is a very dark grayish blue in the neutral family. In OKLCH it sits at lightness 0.278, chroma 0.030 and hue 256.8°. The nearest CSS named color is black (#000000), ΔE2000 13.1 away.

Relative luminance
0.0215
OKLCH L · C · h
0.278 · 0.030 · 256.8
Best text
White 14.67:1
Hue family
Neutral
Inspect this color Check contrast

#1F2937 color codes

HEX
#1F2937
RGB
rgb(31, 41, 55)
HSL
hsl(215, 28%, 17%)
OKLCH
oklch(0.278 0.030 256.8)
OKLab
oklab(0.278 -0.007 -0.029)
CIELAB (D65)
L* 16.27, a* 0.03, b* -10.41
XYZ (D65)
X 2.05, Y 2.15, Z 3.92
CMYK (naive)
cmyk(44%, 25%, 0%, 78%)

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 #1F2937 accessible?

White text on it reaches 14.67:1, passing AAA. Black text fails at 1.43:1.

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

    1.43:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc 0

    Text is here, unreadable at 1.43:1

  • White text on it

    14.67:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −104

  • As text on black

    1.43:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc 0

    Text is here, unreadable at 1.43:1

  • As text on white

    14.67:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc +101

Nearest versions that pass 4.5:1

  • For text on white

    #1F2937 14.67:1

    It already reaches 14.67:1 on white, so no change is needed.

  • For text on black

    #6A7687 4.55:1

    Lightening its OKLCH lightness from 0.28 to 0.56 reaches 4.55:1 on black, keeping the hue.

    Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #1F2937 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 #1F2937

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #1F2937 sits at step 900.

  1. 50#EFF6FF
    White
    1.08
    Black
    19.29
  2. 100#E1ECFC
    White
    1.19
    Black
    17.60
  3. 200#CDD9E9
    White
    1.42
    Black
    14.69
  4. 300#B3BFD0
    White
    1.86
    Black
    11.27
  5. 400#96A3B4
    White
    2.56
    Black
    8.19
  6. 500#7B8798
    White
    3.64
    Black
    5.76
  7. 600#647080
    White
    5.03
    Black
    4.17
  8. 700#4E5968
    White
    7.11
    Black
    2.95
  9. 800#37404E
    White
    10.46
    Black
    2.00
  10. 900This color#1F2937
    White
    14.67
    Black
    1.43
  11. 950#0F1620
    White
    18.16
    Black
    1.15

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

Tailwind CSS v3 gray scale

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

  1. 50#F9FAFB
    White
    1.04
    Black
    20.09
  2. 100#F3F4F6
    White
    1.10
    Black
    19.08
  3. 200#E5E7EB
    White
    1.23
    Black
    16.96
  4. 300#D1D5DB
    White
    1.47
    Black
    14.25
  5. 400#9CA3AF
    White
    2.53
    Black
    8.27
  6. 500#6B7280
    White
    4.83
    Black
    4.34
  7. 600#4B5563
    White
    7.55
    Black
    2.77
  8. 700#374151
    White
    10.30
    Black
    2.03
  9. 800This color#1F2937
    White
    14.67
    Black
    1.43
  10. 900#111827
    White
    17.73
    Black
    1.18
  11. 950#030712
    White
    20.13
    Black
    1.04

Gamut

How vivid #1F2937 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.099; #1F2937 uses 30% of it. Display P3, which many recent phones and laptops show, reaches 0.126 there: 27% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.030
sRGB edge
0.099
Display P3 edge
0.126
Rec. 2020 edge
0.219
Dominant wavelength
477 nm
Excitation purity
29%
Chromaticity
x 0.2521, y 0.2651
  • This color#1F2937
  • Most vivid in sRGB#002657
  • Most vivid in Display P3oklch(0.278 0.126 256.8)

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

Use the wider color where screens show it
.accent {
  color: #1f2937;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0 0.1325 0.3765); }
}

Mixing

Mixing #1F2937

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%#8F949B
  • OKLab50%#868C95
  • OKLCH50%#868C95

Black #000000

  • sRGB50%#10151C
  • OKLab50%#06090F
  • OKLCH50%#06090F

Its complement #312718

  • sRGB50%#282828
  • OKLab50%#282929
  • OKLCH50%#1A2D25
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #1f2937, white);
color: color-mix(in oklch, #1f2937 50%, white);

In use

#1F2937 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, 4.5:114.67:1 Passes
  • Link and body-size textText, 4.5:114.67:1 Passes
  • Large headingLarge text, 3:114.67:1 Passes
  • Icons, borders and focus ringsNon-text, 3:114.67:1 Passes

Dark page

  • Button labelText, 4.5:114.67:1 Passes
  • Link and body-size textText, 4.5:11.27:1 Fails
  • Large headingLarge text, 3:11.27:1 Fails
  • Icons, borders and focus ringsNon-text, 3:11.27:1 Fails

For text on this page, the nearest shade that passes is #727E8F 4.54:1

Color vision

How #1F2937 looks with color blindness

Tritanopia changes it most, ΔE2000 10.4; protanopia changes it least, 2.1.

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

    #242A38 ΔE2000 2.1

    Close match

    Reads as very dark grayish blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #212737 ΔE2000 2.9

    Close match

    Reads as very dark grayish blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #172C2E ΔE2000 10.4

    Distinct

    Reads as very dark grayish teal

  • Achromatopsia

    No cone color vision; lightness only

    #282828 ΔE2000 8.4

    Noticeable

    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 #1F2937

Its complement is #312718, 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#1F2937
  • Complement#312718

Complementary

Open in Harmony Studio
  • −30°#182B34
  • Base#1F2937
  • +30°#272636

Analogous

Open in Harmony Studio
  • Base#1F2937
  • +120°#362223
  • +240°#222C1D

Triadic

Open in Harmony Studio
  • Base#1F2937
  • +150°#35241C
  • +210°#2A2918

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-gray-800: #1f2937;
}

Tailwind config

// tailwind.config.js — already built in as gray-800;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        gray: { 800: '#1f2937' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own gray-800; this pins the v3 value. */
  --color-gray-800: oklch(0.278 0.030 256.8);
}

Design token (W3C DTCG)

{
  "color": {
    "gray-800": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.1216, 0.1608, 0.2157],
        "hex": "#1f2937"
      },
      "$description": "Tailwind CSS v3 gray-800"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let gray800 = Color(.sRGB, red: 0.122, green: 0.161, blue: 0.216, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Gray800 = Color(0xFF1F2937)
}

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 #1F2937 in the tools

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