Tailwind CSS v3 color

Tailwind slate-100 #F1F5F9

Tailwind CSS v3's slate-100 is #F1F5F9. It is an off-white in the neutral family. In OKLCH it sits at lightness 0.968 with chroma 0.007, too low for hue to matter. The nearest CSS named color is aliceblue (#F0F8FF), ΔE2000 1.9 away.

Relative luminance: 0.9085
OKLCH L · C · h: 0.968 · 0.007 · 247.9
Best text: Black 19.16:1
Hue family: Neutral

Inspect this color Check contrast

#F1F5F9 color codes

HEX: #F1F5F9
RGB: rgb(241, 245, 249)
HSL: hsl(210, 40%, 96%)
OKLCH: oklch(0.968 0.007 247.9)
OKLab: oklab(0.968 -0.003 -0.006)
CIELAB (D65): L* 96.35, a* -0.60, b* -2.38
XYZ (D65): X 86.02, Y 90.84, Z 102.61
CMYK (naive): cmyk(3%, 2%, 0%, 2%)

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 #F1F5F9 accessible?

Black text on it reaches 19.16:1, passing AAA. White text fails at 1.09:1.

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

19.16:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +99
White text on it

1.09:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.09:1
As text on black

19.16:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −100
As text on white

1.09:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.09:1

Nearest versions that pass 4.5:1

For text on white

#727679 4.58:1

Darkening its OKLCH lightness from 0.97 to 0.56 reaches 4.58:1 on white, keeping the hue.

Compare both in the Contrast System
For text on black

#F1F5F9 19.16:1

It already reaches 19.16:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #F1F5F9 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 #F1F5F9

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #F1F5F9 sits at step 50.

50This color#F1F5F9

White
1.09
Black
19.16
100#E8EBEF

White
1.19
Black
17.56
200#D4D8DB

White
1.43
Black
14.64
300#BABEC2

White
1.86
Black
11.23
400#9EA2A6

White
2.56
Black
8.17
500#83878A

White
3.62
Black
5.79
600#6C6F72

White
5.05
Black
4.15
700#55585C

White
7.15
Black
2.93
800#3D4043

White
10.43
Black
2.01
900#27292C

White
14.58
Black
1.43
950#141618

White
18.13
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.

50#F8FAFC
White
1.04
Black
20.07
100This color#F1F5F9

White
1.09
Black
19.16
200#E2E8F0
White
1.23
Black
17.03
300#CBD5E1
White
1.48
Black
14.14
400#94A3B8
White
2.56
Black
8.19
500#64748B
White
4.75
Black
4.41
600#475569
White
7.57
Black
2.77
700#334155
White
10.35
Black
2.02
800#1E293B
White
14.62
Black
1.43
900#0F172A
White
17.85
Black
1.17
950#020617
White
20.17
Black
1.04

Gamut

How vivid #F1F5F9 can get

A gray has no hue, so no gamut holds a more vivid version of #F1F5F9: more chroma would make it another color.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.007
sRGB edge: No hue
Display P3 edge: No hue
Rec. 2020 edge: No hue
Dominant wavelength: 481 nm
Excitation purity: 2%
Chromaticity: x 0.3078, y 0.3251

Mixing

Mixing #F1F5F9

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%#F8FAFC
OKLab50%#F8FAFC
OKLCH50%#F8FAFC

Black #000000

sRGB50%#797B7D
OKLab50%#5D5F61
OKLCH50%#5D5F61

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #f1f5f9, white);
color: color-mix(in oklch, #f1f5f9 50%, white);

In use

#F1F5F9 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, 4.5:119.16:1 Passes
Link and body-size textText, 4.5:11.09:1 Fails
Large headingLarge text, 3:11.09:1 Fails
Icons, borders and focus ringsNon-text, 3:11.09:1 Fails

For text on this page, the nearest shade that passes is #727679 4.58:1

Dark page

Button labelText, 4.5:119.16:1 Passes
Link and body-size textText, 4.5:117.10:1 Passes
Large headingLarge text, 3:117.10:1 Passes
Icons, borders and focus ringsNon-text, 3:117.10:1 Passes

Color vision

How #F1F5F9 looks with color blindness

As a neutral it barely changes under any simulation, ΔE2000 2.8 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

#F4F5F9 ΔE2000 1.5

Very close

Reads as off-white
Deuteranopia

No working green (medium-wavelength) cones

#F3F4F9 ΔE2000 1.7

Very close

Reads as off-white
Tritanopia

No working blue (short-wavelength) cones

#EFF6F6 ΔE2000 2.8

Close match

Reads as off-white
Achromatopsia

No cone color vision; lightness only

#F4F4F4 ΔE2000 2.4

Close match

Reads as off-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 #F1F5F9

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 #141618 · 16.55:1

Body text, AAA
Step 700 #55585C · 6.52:1

Body text, AA
Step 300 #BABEC2 · 1.70:1

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-100: #f1f5f9;
}

Tailwind config

// tailwind.config.js — already built in as slate-100;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        slate: { 100: '#f1f5f9' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own slate-100; this pins the v3 value. */
  --color-slate-100: oklch(0.968 0.007 247.9);
}

Design token (W3C DTCG)

{
  "color": {
    "slate-100": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.9451, 0.9608, 0.9765],
        "hex": "#f1f5f9"
      },
      "$description": "Tailwind CSS v3 slate-100"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let slate100 = Color(.sRGB, red: 0.945, green: 0.961, blue: 0.976, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Slate100 = Color(0xFFF1F5F9)
}

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 #F1F5F9 in the tools

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