Tailwind CSS v3 color

Tailwind slate-300 #CBD5E1

Tailwind CSS v3's slate-300 is #CBD5E1. It is a light gray in the neutral family. In OKLCH it sits at lightness 0.869 with chroma 0.020, too low for hue to matter. The nearest CSS named color is lightgray (#D3D3D3), ΔE2000 6.2 away.

Relative luminance
0.6572
OKLCH L · C · h
0.869 · 0.020 · 252.9
Best text
Black 14.14:1
Hue family
Neutral
Inspect this color Check contrast

#CBD5E1 color codes

HEX
#CBD5E1
RGB
rgb(203, 213, 225)
HSL
hsl(213, 27%, 84%)
OKLCH
oklch(0.869 0.020 252.9)
OKLab
oklab(0.869 -0.006 -0.019)
CIELAB (D65)
L* 84.85, a* -1.06, b* -7.06
XYZ (D65)
X 62.01, Y 65.72, Z 80.64
CMYK (naive)
cmyk(10%, 5%, 0%, 12%)

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 #CBD5E1 accessible?

Black text on it reaches 14.14:1, passing AAA. White text fails at 1.48:1.

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

    14.14:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc +80

  • White text on it

    1.48:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc −25

    Text is here, unreadable at 1.48:1

  • As text on black

    14.14:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −80

  • As text on white

    1.48:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc +22

    Text is here, unreadable at 1.48:1

Nearest versions that pass 4.5:1

  • For text on white

    #6E7781 4.54:1

    Darkening its OKLCH lightness from 0.87 to 0.56 reaches 4.54:1 on white, keeping the hue.

    Compare both in the Contrast System

  • For text on black

    #CBD5E1 14.14:1

    It already reaches 14.14:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #CBD5E1 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 #CBD5E1

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #CBD5E1 sits at step 200.

  1. 50#EEF6FF
    White
    1.09
    Black
    19.26
  2. 100#E4ECF6
    White
    1.19
    Black
    17.62
  3. 200This color#CBD5E1
    White
    1.48
    Black
    14.14
  4. 300#B6BFCA
    White
    1.85
    Black
    11.29
  5. 400#99A3AE
    White
    2.55
    Black
    8.20
  6. 500#7E8792
    White
    3.64
    Black
    5.76
  7. 600#67707A
    White
    5.02
    Black
    4.17
  8. 700#515963
    White
    7.09
    Black
    2.95
  9. 800#394049
    White
    10.48
    Black
    2.00
  10. 900#232931
    White
    14.65
    Black
    1.43
  11. 950#11171D
    White
    18.03
    Black
    1.16

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. 300This color#CBD5E1
    White
    1.48
    Black
    14.14
  5. 400#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 #CBD5E1 can get

A gray has no hue, so no gamut holds a more vivid version of #CBD5E1: more chroma would make it another color.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.020
sRGB edge
No hue
Display P3 edge
No hue
Rec. 2020 edge
No hue
Dominant wavelength
480 nm
Excitation purity
7%
Chromaticity
x 0.2976, y 0.3154

Mixing

Mixing #CBD5E1

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%#E5EAF0
  • OKLab50%#E5EAF0
  • OKLCH50%#E5EAF0

Black #000000

  • sRGB50%#666B71
  • OKLab50%#4D5156
  • OKLCH50%#4D5156
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #cbd5e1, white);
color: color-mix(in oklch, #cbd5e1 50%, white);

In use

#CBD5E1 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, 4.5:114.14:1 Passes
  • Link and body-size textText, 4.5:11.48:1 Fails
  • Large headingLarge text, 3:11.48:1 Fails
  • Icons, borders and focus ringsNon-text, 3:11.48:1 Fails

For text on this page, the nearest shade that passes is #6E7781 4.54:1

Dark page

  • Button labelText, 4.5:114.14:1 Passes
  • Link and body-size textText, 4.5:112.61:1 Passes
  • Large headingLarge text, 3:112.61:1 Passes
  • Icons, borders and focus ringsNon-text, 3:112.61:1 Passes

Color vision

How #CBD5E1 looks with color blindness

As a neutral it barely changes under any simulation, ΔE2000 7.1 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

    #D1D5E2 ΔE2000 3.0

    Close match

    Reads as light gray

  • Deuteranopia

    No working green (medium-wavelength) cones

    #CED3E1 ΔE2000 2.8

    Close match

    Reads as pale grayish blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #C6D8D9 ΔE2000 7.1

    Noticeable

    Reads as light gray

  • Achromatopsia

    No cone color vision; lightness only

    #D4D4D4 ΔE2000 6.2

    Noticeable

    Reads as light 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 #CBD5E1

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 #11171D · 12.15:1

    Body text, AAA

  • Step 700 #515963 · 4.78:1

    Body text, AA

  • Step 300 #B6BFCA · 1.25:1

    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-slate-300: #cbd5e1;
}

Tailwind config

// tailwind.config.js — already built in as slate-300;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        slate: { 300: '#cbd5e1' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own slate-300; this pins the v3 value. */
  --color-slate-300: oklch(0.869 0.020 252.9);
}

Design token (W3C DTCG)

{
  "color": {
    "slate-300": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.7961, 0.8353, 0.8824],
        "hex": "#cbd5e1"
      },
      "$description": "Tailwind CSS v3 slate-300"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let slate300 = Color(.sRGB, red: 0.796, green: 0.835, blue: 0.882, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Slate300 = Color(0xFFCBD5E1)
}

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 #CBD5E1 in the tools

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