CSS named color

Light Slate Gray #778899

The CSS keyword lightslategray is #778899. It is a grayish blue in the neutral family. In OKLCH it sits at lightness 0.619, chroma 0.032 and hue 248.4°.

Relative luminance
0.2383
OKLCH L · C · h
0.619 · 0.032 · 248.4
Best text
Black 5.76:1
Hue family
Neutral
Inspect this color Check contrast

#778899 color codes

HEX
#778899
RGB
rgb(119, 136, 153)
HSL
hsl(210, 14%, 53%)
OKLCH
oklch(0.619 0.032 248.4)
OKLab
oklab(0.619 -0.012 -0.030)
CIELAB (D65)
L* 55.92, a* -2.25, b* -11.11
XYZ (D65)
X 22.16, Y 23.83, Z 33.56
CMYK (naive)
cmyk(22%, 11%, 0%, 40%)

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 #778899 accessible?

Black text on it reaches 5.76:1, passing AA. White text manages only 3.64:1, enough for large text only.

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

    5.76:1

    • AA passes
    • AA large passes
    • AAA fails
    • APCA Lc +40

  • White text on it

    3.64:1

    • AA fails
    • AA large passes
    • AAA fails
    • APCA Lc −69

  • As text on black

    5.76:1

    • AA passes
    • AA large passes
    • AAA fails
    • APCA Lc −37

  • As text on white

    3.64:1

    • AA fails
    • AA large passes
    • AAA fails
    • APCA Lc +64

Nearest versions that pass 4.5:1

  • For text on white

    #677888 4.54:1

    Darkening its OKLCH lightness from 0.62 to 0.56 reaches 4.54:1 on white, keeping the hue.

    Compare both in the Contrast System

  • For text on black

    #778899 5.76:1

    It already reaches 5.76:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #778899 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 #778899

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #778899 sits at step 500.

  1. 50#EEF6FF
    White
    1.09
    Black
    19.26
  2. 100#DEEDFD
    White
    1.19
    Black
    17.63
  3. 200#C9DAEA
    White
    1.42
    Black
    14.70
  4. 300#AFC0D1
    White
    1.86
    Black
    11.28
  5. 400#92A4B5
    White
    2.56
    Black
    8.19
  6. 500This color#778899
    White
    3.64
    Black
    5.76
  7. 600#607181
    White
    5.02
    Black
    4.17
  8. 700#4A5A69
    White
    7.10
    Black
    2.95
  9. 800#33414F
    White
    10.44
    Black
    2.00
  10. 900#1E2A36
    White
    14.58
    Black
    1.43
  11. 950#0D1721
    White
    18.07
    Black
    1.16

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

Gamut

How vivid #778899 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.168; #778899 uses 19% of it. Display P3, which many recent phones and laptops show, reaches 0.218 there: 29% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.032
sRGB edge
0.168
Display P3 edge
0.218
Rec. 2020 edge
0.235
Dominant wavelength
480 nm
Excitation purity
15%
Chromaticity
x 0.2786, y 0.2995
  • This color#778899
  • Most vivid in sRGB#008AE5
  • Most vivid in Display P3oklch(0.619 0.218 248.4)

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

Use the wider color where screens show it
.accent {
  color: #778899;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0 0.5204 0.9704); }
}

Mixing

Mixing #778899

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%#BBC4CC
  • OKLab50%#B9C2CB
  • OKLCH50%#B9C2CB

Black #000000

  • sRGB50%#3C444D
  • OKLab50%#2A3138
  • OKLCH50%#2A3138

Its complement #938371

  • sRGB50%#858685
  • OKLab50%#868686
  • OKLCH50%#768C7F
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #778899, white);
color: color-mix(in oklch, #778899 50%, white);

In use

#778899 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, 4.5:15.76:1 Passes
  • Link and body-size textText, 4.5:13.64:1 Fails
  • Large headingLarge text, 3:13.64:1 Passes
  • Icons, borders and focus ringsNon-text, 3:13.64:1 Passes

For text on this page, the nearest shade that passes is #677888 4.54:1

Dark page

  • Button labelText, 4.5:15.76:1 Passes
  • Link and body-size textText, 4.5:15.14:1 Passes
  • Large headingLarge text, 3:15.14:1 Passes
  • Icons, borders and focus ringsNon-text, 3:15.14:1 Passes

Color vision

How #778899 looks with color blindness

Tritanopia changes it most, ΔE2000 10.4; protanopia changes it least, 5.2.

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

    #82889A ΔE2000 5.2

    Noticeable

    Reads as grayish blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #7E8499 ΔE2000 6.0

    Noticeable

    Reads as grayish blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #6E8C8D ΔE2000 10.4

    Distinct

    Reads as grayish cyan

  • Achromatopsia

    No cone color vision; lightness only

    #868686 ΔE2000 9.2

    Noticeable

    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 #778899

Its complement is #938371, a grayish orange.

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

Open the Harmony Studio
  • Base#778899
  • Complement#938371

Complementary

Open in Harmony Studio
  • −30°#718B93
  • Base#778899
  • +30°#81849A

Analogous

Open in Harmony Studio
  • Base#778899
  • +120°#987E82
  • +240°#808A75

Triadic

Open in Harmony Studio
  • Base#778899
  • +150°#988078
  • +210°#8B8670

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-lightslategray: #778899;
}

Tailwind config

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        lightslategray: '#778899',
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  --color-lightslategray: oklch(0.619 0.032 248.4);
}

Design token (W3C DTCG)

{
  "color": {
    "lightslategray": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.4667, 0.5333, 0.6],
        "hex": "#778899"
      },
      "$description": "CSS named color lightslategray"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let lightslategray = Color(.sRGB, red: 0.467, green: 0.533, blue: 0.600, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Lightslategray = Color(0xFF778899)
}

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 #778899 in the tools

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