Tailwind CSS v3 color

Tailwind neutral-400 #A3A3A3

Tailwind CSS v3's neutral-400 is #A3A3A3. It is a gray in the neutral family. In OKLCH it sits at lightness 0.715 with chroma 0.000, too low for hue to matter. The nearest CSS named color is darkgray (#A9A9A9), ΔE2000 1.8 away.

Relative luminance: 0.3663
OKLCH L · C · h: 0.715 · 0.000 · —
Best text: Black 8.32:1
Hue family: Neutral

Inspect this color Check contrast

#A3A3A3 color codes

HEX: #A3A3A3
RGB: rgb(163, 163, 163)
HSL: hsl(0, 0%, 64%)
OKLCH: oklch(0.715 0.000 0)
OKLab: oklab(0.715 0.000 0.000)
CIELAB (D65): L* 66.99, a* 0.00, b* 0.00
XYZ (D65): X 34.81, Y 36.63, Z 39.88
CMYK (naive): cmyk(0%, 0%, 0%, 36%)

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 #A3A3A3 accessible?

Black text on it reaches 8.32:1, passing AAA. White text fails at 2.52:1.

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

8.32:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +54
White text on it

2.52:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc −54
As text on black

8.32:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −52
As text on white

2.52:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc +49

Nearest versions that pass 4.5:1

For text on white

#767676 4.54:1

Darkening its OKLCH lightness from 0.72 to 0.57 reaches 4.54:1 on white, keeping the hue.

Compare both in the Contrast System
For text on black

#A3A3A3 8.32:1

It already reaches 8.32:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #A3A3A3 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 #A3A3A3

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #A3A3A3 sits at step 400.

50#F5F5F5
White
1.09
Black
19.26
100#EBEBEB

White
1.19
Black
17.61
200#D7D7D7
White
1.43
Black
14.59
300#BEBEBE

White
1.85
Black
11.29
400This color#A3A3A3

White
2.52
Black
8.32
500#868686

White
3.64
Black
5.76
600#6F6F6F

White
5.02
Black
4.17
700#585858

White
7.11
Black
2.95
800#404040
White
10.36
Black
2.02
900#292929

White
14.54
Black
1.44
950#161616

White
18.09
Black
1.16

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

Tailwind CSS v3 neutral scale

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

50#FAFAFA
White
1.04
Black
20.11
100#F5F5F5
White
1.09
Black
19.26
200#E5E5E5
White
1.25
Black
16.67
300#D4D4D4
White
1.48
Black
14.16
400This color#A3A3A3

White
2.52
Black
8.32
500#737373
White
4.74
Black
4.42
600#525252
White
7.81
Black
2.68
700#404040
White
10.36
Black
2.02
800#262626
White
15.13
Black
1.38
900#171717
White
17.92
Black
1.17
950#0A0A0A
White
19.79
Black
1.06

Gamut

How vivid #A3A3A3 can get

A gray has no hue, so no gamut holds a more vivid version of #A3A3A3: more chroma would make it another color.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.000
sRGB edge: No hue
Display P3 edge: No hue
Rec. 2020 edge: No hue
Dominant wavelength: None, near white
Excitation purity: 0%
Chromaticity: x 0.3127, y 0.3290

Mixing

Mixing #A3A3A3

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%#D1D1D1
OKLab50%#D0D0D0
OKLCH50%#D0D0D0

Black #000000

sRGB50%#525252
OKLab50%#3C3C3C
OKLCH50%#3C3C3C

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #a3a3a3, white);
color: color-mix(in oklch, #a3a3a3 50%, white);

In use

#A3A3A3 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, 4.5:18.32:1 Passes
Link and body-size textText, 4.5:12.52:1 Fails
Large headingLarge text, 3:12.52:1 Fails
Icons, borders and focus ringsNon-text, 3:12.52:1 Fails

For text on this page, the nearest shade that passes is #767676 4.54:1

Dark page

Button labelText, 4.5:18.32:1 Passes
Link and body-size textText, 4.5:17.42:1 Passes
Large headingLarge text, 3:17.42:1 Passes
Icons, borders and focus ringsNon-text, 3:17.42:1 Passes

Color vision

How #A3A3A3 looks with color blindness

As a neutral it barely changes under any simulation, ΔE2000 0.0 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

#A3A3A3 ΔE2000 0.0

Imperceptible

Reads as gray
Deuteranopia

No working green (medium-wavelength) cones

#A3A3A3 ΔE2000 0.0

Imperceptible

Reads as gray
Tritanopia

No working blue (short-wavelength) cones

#A3A3A3 ΔE2000 0.0

Imperceptible

Reads as gray
Achromatopsia

No cone color vision; lightness only

#A3A3A3 ΔE2000 0.0

Imperceptible

Reads as gray

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 #A3A3A3

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 950 #161616 · 7.17:1

Body text, AAA
Step 700 #585858 · 2.82:1

Decoration only, under 3:1
Step 300 #BEBEBE · 1.35:1

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-neutral-400: #a3a3a3;
}

Tailwind config

// tailwind.config.js — already built in as neutral-400;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        neutral: { 400: '#a3a3a3' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own neutral-400; this pins the v3 value. */
  --color-neutral-400: oklch(0.715 0.000 0);
}

Design token (W3C DTCG)

{
  "color": {
    "neutral-400": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.6392, 0.6392, 0.6392],
        "hex": "#a3a3a3"
      },
      "$description": "Tailwind CSS v3 neutral-400"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let neutral400 = Color(.sRGB, red: 0.639, green: 0.639, blue: 0.639, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Neutral400 = Color(0xFFA3A3A3)
}

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 #A3A3A3 in the tools

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