Tailwind CSS v3 color

Tailwind slate-400 #94A3B8

Tailwind CSS v3's slate-400 is #94A3B8. It is a light grayish blue in the blue family. In OKLCH it sits at lightness 0.711, chroma 0.035 and hue 256.8°. The nearest CSS named color is lightsteelblue (#B0C4DE), ΔE2000 9.2 away.

Relative luminance
0.3595
OKLCH L · C · h
0.711 · 0.035 · 256.8
Best text
Black 8.19:1
Hue family
Blue
Inspect this color Check contrast

#94A3B8 color codes

HEX
#94A3B8
RGB
rgb(148, 163, 184)
HSL
hsl(215, 20%, 65%)
OKLCH
oklch(0.711 0.035 256.8)
OKLab
oklab(0.711 -0.008 -0.034)
CIELAB (D65)
L* 66.48, a* -0.73, b* -12.59
XYZ (D65)
X 33.96, Y 35.95, Z 50.49
CMYK (naive)
cmyk(20%, 11%, 0%, 28%)

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 #94A3B8 accessible?

Black text on it reaches 8.19:1, passing AAA. White text fails at 2.56:1.

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

    8.19:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc +53

  • White text on it

    2.56:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc −55

  • As text on black

    8.19:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −51

  • As text on white

    2.56:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc +50

Nearest versions that pass 4.5:1

  • For text on white

    #69778B 4.55:1

    Darkening its OKLCH lightness from 0.71 to 0.57 reaches 4.55:1 on white, keeping the hue.

    Compare both in the Contrast System

  • For text on black

    #94A3B8 8.19:1

    It already reaches 8.19:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #94A3B8 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 #94A3B8

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #94A3B8 sits at step 400.

  1. 50#EFF6FF
    White
    1.08
    Black
    19.29
  2. 100#DFECFF
    White
    1.19
    Black
    17.57
  3. 200#CBD9EC
    White
    1.43
    Black
    14.67
  4. 300#B1BFD3
    White
    1.86
    Black
    11.26
  5. 400This color#94A3B8
    White
    2.56
    Black
    8.19
  6. 500#79879C
    White
    3.64
    Black
    5.75
  7. 600#627083
    White
    5.04
    Black
    4.16
  8. 700#4C596B
    White
    7.12
    Black
    2.94
  9. 800#354151
    White
    10.36
    Black
    2.02
  10. 900#1F2938
    White
    14.65
    Black
    1.43
  11. 950#0E1622
    White
    18.15
    Black
    1.15

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.

  1. 50#F8FAFC
    White
    1.04
    Black
    20.07
  2. 100#F1F5F9
    White
    1.09
    Black
    19.16
  3. 200#E2E8F0
    White
    1.23
    Black
    17.03
  4. 300#CBD5E1
    White
    1.48
    Black
    14.14
  5. 400This color#94A3B8
    White
    2.56
    Black
    8.19
  6. 500#64748B
    White
    4.75
    Black
    4.41
  7. 600#475569
    White
    7.57
    Black
    2.77
  8. 700#334155
    White
    10.35
    Black
    2.02
  9. 800#1E293B
    White
    14.62
    Black
    1.43
  10. 900#0F172A
    White
    17.85
    Black
    1.17
  11. 950#020617
    White
    20.17
    Black
    1.04

Gamut

How vivid #94A3B8 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.153; #94A3B8 uses 23% of it. Display P3, which many recent phones and laptops show, reaches 0.165 there: 8% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.035
sRGB edge
0.153
Display P3 edge
0.165
Rec. 2020 edge
0.167
Dominant wavelength
478 nm
Excitation purity
14%
Chromaticity
x 0.2821, y 0.2986
  • This color#94A3B8
  • Most vivid in sRGB#5FA2FF
  • Most vivid in Display P3oklch(0.711 0.165 256.8)

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

Use the wider color where screens show it
.accent {
  color: #94a3b8;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.4165 0.6277 1); }
}

Mixing

Mixing #94A3B8

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%#CAD1DC
  • OKLab50%#C8D0DB
  • OKLCH50%#C8D0DB

Black #000000

  • sRGB50%#4A525C
  • OKLab50%#363C45
  • OKLCH50%#363C45

Its complement #AE9F8A

  • sRGB50%#A1A1A1
  • OKLab50%#A1A1A2
  • OKLCH50%#B399A6
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #94a3b8, white);
color: color-mix(in oklch, #94a3b8 50%, white);

In use

#94A3B8 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, 4.5:18.19:1 Passes
  • Link and body-size textText, 4.5:12.56:1 Fails
  • Large headingLarge text, 3:12.56:1 Fails
  • Icons, borders and focus ringsNon-text, 3:12.56:1 Fails

For text on this page, the nearest shade that passes is #69778B 4.55:1

Dark page

  • Button labelText, 4.5:18.19:1 Passes
  • Link and body-size textText, 4.5:17.30:1 Passes
  • Large headingLarge text, 3:17.30:1 Passes
  • Icons, borders and focus ringsNon-text, 3:17.30:1 Passes

Color vision

How #94A3B8 looks with color blindness

Tritanopia changes it most, ΔE2000 11.0; protanopia changes it least, 3.2.

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

    #9CA4B9 ΔE2000 3.2

    Close match

    Reads as light grayish blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #98A0B8 ΔE2000 3.8

    Close match

    Reads as light grayish blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #8BA7AA ΔE2000 11.0

    Distinct

    Reads as light grayish cyan

  • Achromatopsia

    No cone color vision; lightness only

    #A2A2A2 ΔE2000 9.8

    Noticeable

    Reads as gray

Pairing check

Checked against its complement, #AE9F8A. Their lightness contrast is only 1.00:1, so where hue collapses, add a label, icon or pattern.

VisionThe pairΔE2000Verdict
Normal vision#94A3B8 · #AE9F8A20.2Stays distinct
Protanopia#9CA4B9 · #A59F8920.9Stays distinct
Deuteranopia#98A0B8 · #A9A28A22.3Stays distinct
Tritanopia#8BA7AA · #B59B9926.4Stays distinct
Achromatopsia#A2A2A2 · #A1A1A10.3Easily confused

Harmony

Color harmonies for #94A3B8

Its complement is #AE9F8A, a light grayish amber.

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

Open the Harmony Studio
  • Base#94A3B8
  • Complement#AE9F8A

Complementary

Open in Harmony Studio
  • −30°#8BA7B3
  • Base#94A3B8
  • +30°#A09FB7

Analogous

Open in Harmony Studio
  • Base#94A3B8
  • +120°#B7999A
  • +240°#98A792

Triadic

Open in Harmony Studio
  • Base#94A3B8
  • +150°#B59C8F
  • +210°#A4A48B

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-400: #94a3b8;
}

Tailwind config

// tailwind.config.js — already built in as slate-400;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        slate: { 400: '#94a3b8' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own slate-400; this pins the v3 value. */
  --color-slate-400: oklch(0.711 0.035 256.8);
}

Design token (W3C DTCG)

{
  "color": {
    "slate-400": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.5804, 0.6392, 0.7216],
        "hex": "#94a3b8"
      },
      "$description": "Tailwind CSS v3 slate-400"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let slate400 = Color(.sRGB, red: 0.580, green: 0.639, blue: 0.722, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Slate400 = Color(0xFF94A3B8)
}

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 #94A3B8 in the tools

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