Tailwind CSS v3 color

Tailwind slate-800 #1E293B

Tailwind CSS v3's slate-800 is #1E293B. It is a very dark grayish blue in the blue family. In OKLCH it sits at lightness 0.279, chroma 0.037 and hue 260.0°. The nearest CSS named color is midnightblue (#191970), ΔE2000 13.1 away.

Relative luminance: 0.0218
OKLCH L · C · h: 0.279 · 0.037 · 260.0
Best text: White 14.62:1
Hue family: Blue

Inspect this color Check contrast

#1E293B color codes

HEX: #1E293B
RGB: rgb(30, 41, 59)
HSL: hsl(217, 33%, 17%)
OKLCH: oklch(0.279 0.037 260.0)
OKLab: oklab(0.279 -0.006 -0.036)
CIELAB (D65): L* 16.39, a* 1.07, b* -13.02
XYZ (D65): X 2.12, Y 2.18, Z 4.45
CMYK (naive): cmyk(49%, 31%, 0%, 77%)

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 #1E293B accessible?

White text on it reaches 14.62:1, passing AAA. Black text fails at 1.43:1.

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

1.43:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.43:1
White text on it

14.62:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −104
As text on black

1.43:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc 0
Text is here, unreadable at 1.43:1
As text on white

14.62:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +101

Nearest versions that pass 4.5:1

For text on white

#1E293B 14.62:1

It already reaches 14.62:1 on white, so no change is needed.
For text on black

#68758A 4.50:1

Lightening its OKLCH lightness from 0.28 to 0.56 reaches 4.50:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #1E293B 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 #1E293B

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #1E293B sits at step 900.

50#F0F6FF

White
1.08
Black
19.33
100#E0ECFF

White
1.19
Black
17.61
200#CBD8ED

White
1.43
Black
14.58
300#B1BFD5

White
1.86
Black
11.28
400#95A2B9

White
2.57
Black
8.14
500#79879D

White
3.64
Black
5.76
600#626F84

White
5.08
Black
4.12
700#4C596C

White
7.11
Black
2.95
800#354052

White
10.46
Black
2.00
900This color#1E293B

White
14.62
Black
1.43
950#0F1623

White
18.11
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
100#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
800This color#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 #1E293B can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.115; #1E293B uses 32% of it. Display P3, which many recent phones and laptops show, reaches 0.145 there: 26% more.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.037
sRGB edge: 0.115
Display P3 edge: 0.145
Rec. 2020 edge: 0.213
Dominant wavelength: 476 nm
Excitation purity: 34%
Chromaticity: x 0.2423, y 0.2491

This color#1E293B
Most vivid in sRGB#002360
Most vivid in Display P3oklch(0.279 0.145 260.0)

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

Use the wider color where screens show it

.accent {
  color: #1e293b;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0 0.113 0.4132); }
}

Mixing

Mixing #1E293B

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%#8F949D
OKLab50%#868D98
OKLCH50%#868D98

Black #000000

sRGB50%#0F151E
OKLab50%#050911
OKLCH50%#050911

Its complement #322713

sRGB50%#282827
OKLab50%#282929
OKLCH50%#142F26

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #1e293b, white);
color: color-mix(in oklch, #1e293b 50%, white);

In use

#1E293B 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, 4.5:114.62:1 Passes
Link and body-size textText, 4.5:114.62:1 Passes
Large headingLarge text, 3:114.62:1 Passes
Icons, borders and focus ringsNon-text, 3:114.62:1 Passes

Dark page

Button labelText, 4.5:114.62:1 Passes
Link and body-size textText, 4.5:11.28:1 Fails
Large headingLarge text, 3:11.28:1 Fails
Icons, borders and focus ringsNon-text, 3:11.28:1 Fails

For text on this page, the nearest shade that passes is #717E94 4.56:1

Color vision

How #1E293B looks with color blindness

Tritanopia changes it most, ΔE2000 13.0; protanopia changes it least, 1.4.

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

#222A3C ΔE2000 1.4

Very close

Reads as very dark grayish blue
Deuteranopia

No working green (medium-wavelength) cones

#1F273B ΔE2000 2.2

Close match

Reads as very dark grayish blue
Tritanopia

No working blue (short-wavelength) cones

#142D2F ΔE2000 13.0

Distinct

Reads as very dark grayish teal
Achromatopsia

No cone color vision; lightness only

#292929 ΔE2000 10.1

Distinct

Reads as near-black

Pairing check

Checked against its complement, #322713. Their lightness contrast is only 1.00:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#1E293B · #322713	21.8	Stays distinct
Protanopia	#222A3C · #2C2711	22.7	Stays distinct
Deuteranopia	#1F273B · #2E2A14	24.0	Stays distinct
Tritanopia	#142D2F · #362422	23.0	Stays distinct
Achromatopsia	#292929 · #292929	0.0	Easily confused

Harmony

Color harmonies for #1E293B

Its complement is #322713, a very dark grayish brown, on the warm side of the wheel.

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

Open the Harmony Studio

Base#1E293B
Complement#322713

Complementary

Open in Harmony Studio

−30°#142C37
Base#1E293B
+30°#28263A

Analogous

Open in Harmony Studio

Base#1E293B
+120°#392121
+240°#1F2D1C

Triadic

Open in Harmony Studio

Base#1E293B
+150°#382318
+210°#2A2A14

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-800: #1e293b;
}

Tailwind config

// tailwind.config.js — already built in as slate-800;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        slate: { 800: '#1e293b' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own slate-800; this pins the v3 value. */
  --color-slate-800: oklch(0.279 0.037 260.0);
}

Design token (W3C DTCG)

{
  "color": {
    "slate-800": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.1176, 0.1608, 0.2314],
        "hex": "#1e293b"
      },
      "$description": "Tailwind CSS v3 slate-800"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let slate800 = Color(.sRGB, red: 0.118, green: 0.161, blue: 0.231, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Slate800 = Color(0xFF1E293B)
}

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 #1E293B in the tools

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

Tailwind slate-800 #1E293B

#1E293B color codes

Contrast: is #1E293B accessible?

Black text on it

White text on it

As text on black

As text on white

Nearest versions that pass 4.5:1

Adjust #1E293B live

Shades and tints of #1E293B

Tailwind CSS v3 slate scale

How vivid #1E293B can get

Mixing #1E293B

#1E293B in an interface

How #1E293B looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #1E293B

Complementary

Analogous

Triadic

Split-complementary

Design tokens

CSS custom property

Tailwind config

Tailwind v4 theme

Design token (W3C DTCG)

SwiftUI color

Jetpack Compose color

The nearest match in each system

Similar colors

Open #1E293B in the tools