CSS named color

Azure #F0FFFF

The CSS keyword azure is #F0FFFF. It is a near-white in the neutral family. In OKLCH it sits at lightness 0.989 with chroma 0.016, too low for hue to matter.

Relative luminance
0.9727
OKLCH L · C · h
0.989 · 0.016 · 196.9
Best text
Black 20.45:1
Hue family
Neutral
Inspect this color Check contrast

#F0FFFF color codes

HEX
#F0FFFF
RGB
rgb(240, 255, 255)
HSL
hsl(180, 100%, 97%)
OKLCH
oklch(0.989 0.016 196.9)
OKLab
oklab(0.989 -0.015 -0.005)
CIELAB (D65)
L* 98.93, a* -4.88, b* -1.69
XYZ (D65)
X 89.74, Y 97.26, Z 108.63
CMYK (naive)
cmyk(6%, 0%, 0%, 0%)

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 #F0FFFF accessible?

Black text on it reaches 20.45:1, passing AAA. White text fails at 1.02:1.

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

    20.45:1

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

  • White text on it

    1.02:1

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

    Text is here, unreadable at 1.02:1

  • As text on black

    20.45:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −105

  • As text on white

    1.02:1

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

    Text is here, unreadable at 1.02:1

Nearest versions that pass 4.5:1

  • For text on white

    #6B7979 4.52:1

    Darkening its OKLCH lightness from 0.99 to 0.56 reaches 4.52:1 on white, keeping the hue.

    Compare both in the Contrast System

  • For text on black

    #F0FFFF 20.45:1

    It already reaches 20.45:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #F0FFFF 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 #F0FFFF

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #F0FFFF sits at step 50.

  1. 50This color#F0FFFF
    White
    1.02
    Black
    20.45
  2. 100#E2EEEE
    White
    1.18
    Black
    17.69
  3. 200#CEDADA
    White
    1.43
    Black
    14.66
  4. 300#B3C1C1
    White
    1.85
    Black
    11.31
  5. 400#97A5A5
    White
    2.54
    Black
    8.24
  6. 500#7C8989
    White
    3.62
    Black
    5.79
  7. 600#657272
    White
    4.99
    Black
    4.20
  8. 700#4F5B5B
    White
    7.04
    Black
    2.97
  9. 800#374242
    White
    10.39
    Black
    2.02
  10. 900#212B2B
    White
    14.53
    Black
    1.44
  11. 950#101818
    White
    18.01
    Black
    1.16

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

Gamut

How vivid #F0FFFF can get

A gray has no hue, so no gamut holds a more vivid version of #F0FFFF: 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
0.016
sRGB edge
No hue
Display P3 edge
No hue
Rec. 2020 edge
No hue
Dominant wavelength
491 nm
Excitation purity
3%
Chromaticity
x 0.3035, y 0.3290

Mixing

Mixing #F0FFFF

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%#F8FFFF
  • OKLab50%#F8FFFF
  • OKLCH50%#F8FFFF

Black #000000

  • sRGB50%#788080
  • OKLab50%#5D6363
  • OKLCH50%#5D6363
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #f0ffff, white);
color: color-mix(in oklch, #f0ffff 50%, white);

In use

#F0FFFF 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, 4.5:120.45:1 Passes
  • Link and body-size textText, 4.5:11.02:1 Fails
  • Large headingLarge text, 3:11.02:1 Fails
  • Icons, borders and focus ringsNon-text, 3:11.02:1 Fails

For text on this page, the nearest shade that passes is #6B7979 4.52:1

Dark page

  • Button labelText, 4.5:120.45:1 Passes
  • Link and body-size textText, 4.5:118.24:1 Passes
  • Large headingLarge text, 3:118.24:1 Passes
  • Icons, borders and focus ringsNon-text, 3:118.24:1 Passes

Color vision

How #F0FFFF looks with color blindness

As a neutral it barely changes under any simulation, ΔE2000 6.8 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

    #FDFDFF ΔE2000 6.8

    Noticeable

    Reads as white

  • Deuteranopia

    No working green (medium-wavelength) cones

    #FAFBFF ΔE2000 6.8

    Noticeable

    Reads as white

  • Tritanopia

    No working blue (short-wavelength) cones

    #ECFFFF ΔE2000 1.4

    Very close

    Reads as white

  • Achromatopsia

    No cone color vision; lightness only

    #FCFCFC ΔE2000 6.4

    Noticeable

    Reads as white

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 #F0FFFF

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 #101818 · 17.54:1

    Body text, AAA

  • Step 700 #4F5B5B · 6.86:1

    Body text, AA

  • Step 300 #B3C1C1 · 1.80:1

    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-azure: #f0ffff;
}

Tailwind config

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        azure: '#f0ffff',
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  --color-azure: oklch(0.989 0.016 196.9);
}

Design token (W3C DTCG)

{
  "color": {
    "azure": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.9412, 1, 1],
        "hex": "#f0ffff"
      },
      "$description": "CSS named color azure"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let azure = Color(.sRGB, red: 0.941, green: 1.000, blue: 1.000, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Azure = Color(0xFFF0FFFF)
}

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 #F0FFFF in the tools

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