Tailwind CSS v3 color

Tailwind sky-600 #0284C7

Tailwind CSS v3's sky-600 is #0284C7. It is a soft blue in the blue family. In OKLCH it sits at lightness 0.588, chroma 0.139 and hue 242.0°. The nearest CSS named color is steelblue (#4682B4), ΔE2000 4.0 away.

Relative luminance
0.2064
OKLCH L · C · h
0.588 · 0.139 · 242.0
Best text
Black 5.12:1
Hue family
Blue
Inspect this color Check contrast

#0284C7 color codes

HEX
#0284C7
RGB
rgb(2, 132, 199)
HSL
hsl(200, 98%, 39%)
OKLCH
oklch(0.588 0.139 242.0)
OKLab
oklab(0.588 -0.065 -0.123)
CIELAB (D65)
L* 52.55, a* -5.28, b* -43.02
XYZ (D65)
X 18.58, Y 20.64, Z 57.03
CMYK (naive)
cmyk(99%, 34%, 0%, 22%)

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 #0284C7 accessible?

Black text on it reaches 5.12:1, passing AA. White text manages only 4.09:1, 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

    5.12:1

    • AA passes
    • AA large passes
    • AAA fails
    • APCA Lc +36

  • White text on it

    4.09:1

    • AA fails
    • AA large passes
    • AAA fails
    • APCA Lc −72

  • As text on black

    5.12:1

    • AA passes
    • AA large passes
    • AAA fails
    • APCA Lc −34

  • As text on white

    4.09:1

    • AA fails
    • AA large passes
    • AAA fails
    • APCA Lc +67

Nearest versions that pass 4.5:1

  • For text on white

    #007CBC 4.55:1

    Darkening its OKLCH lightness from 0.59 to 0.56 reaches 4.55:1 on white, keeping the hue.

    Compare both in the Contrast System

  • For text on black

    #0284C7 5.12:1

    It already reaches 5.12:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #0284C7 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 #0284C7

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #0284C7 sits at step 500.

  1. 50#ECF7FF
    White
    1.08
    Black
    19.31
  2. 100#DAEEFF
    White
    1.18
    Black
    17.65
  3. 200#B3DEFF
    White
    1.41
    Black
    14.80
  4. 300#7AC6FF
    White
    1.85
    Black
    11.34
  5. 400#45AAEF
    White
    2.54
    Black
    8.24
  6. 500This color#0284C7
    White
    4.09
    Black
    5.12
  7. 600#0075B2
    White
    5.01
    Black
    4.18
  8. 700#005E8F
    White
    7.00
    Black
    2.99
  9. 800#00446A
    White
    10.31
    Black
    2.03
  10. 900#002C47
    White
    14.47
    Black
    1.45
  11. 950#00182A
    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 sky scale

The real Tailwind palette, for comparison with the computed ramp above.

  1. 50#F0F9FF
    White
    1.06
    Black
    19.69
  2. 100#E0F2FE
    White
    1.14
    Black
    18.30
  3. 200#BAE6FD
    White
    1.32
    Black
    15.82
  4. 300#7DD3FC
    White
    1.66
    Black
    12.59
  5. 400#38BDF8
    White
    2.14
    Black
    9.80
  6. 500#0EA5E9
    White
    2.77
    Black
    7.57
  7. 600This color#0284C7
    White
    4.09
    Black
    5.12
  8. 700#0369A1
    White
    5.93
    Black
    3.53
  9. 800#075985
    White
    7.56
    Black
    2.77
  10. 900#0C4A6E
    White
    9.45
    Black
    2.22
  11. 950#082F49
    White
    13.87
    Black
    1.51

Gamut

How vivid #0284C7 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.139; #0284C7 uses 100% of it. Display P3, which many recent phones and laptops show, reaches 0.182 there: 30% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.139
sRGB edge
0.139
Display P3 edge
0.182
Rec. 2020 edge
0.268
Dominant wavelength
479 nm
Excitation purity
55%
Chromaticity
x 0.1931, y 0.2144
  • This color#0284C7
  • Most vivid in sRGB#0084C7
  • Most vivid in Display P3oklch(0.588 0.182 242.0)

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

Use the wider color where screens show it
.accent {
  color: #0284c7;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0 0.5066 0.8409); }
}

Mixing

Mixing #0284C7

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%#81C2E3
  • OKLab50%#95C2E5
  • OKLCH50%#95C2E5

Black #000000

  • sRGB50%#014264
  • OKLab50%#002F4C
  • OKLCH50%#002F4C

Its complement #B46700

  • sRGB50%#5B7664
  • OKLab50%#7B7D7D
  • OKLCH50%#289352
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #0284c7, white);
color: color-mix(in oklch, #0284c7 50%, white);

In use

#0284C7 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, 4.5:15.12:1 Passes
  • Link and body-size textText, 4.5:14.09:1 Fails
  • Large headingLarge text, 3:14.09:1 Passes
  • Icons, borders and focus ringsNon-text, 3:14.09:1 Passes

For text on this page, the nearest shade that passes is #007CBC 4.55:1

Dark page

  • Button labelText, 4.5:15.12:1 Passes
  • Link and body-size textText, 4.5:14.57:1 Passes
  • Large headingLarge text, 3:14.57:1 Passes
  • Icons, borders and focus ringsNon-text, 3:14.57:1 Passes

Color vision

How #0284C7 looks with color blindness

Achromatopsia changes it most, ΔE2000 22.0; deuteranopia changes it least, 9.8.

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

    #6386CA ΔE2000 10.4

    Distinct

    Reads as soft blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #4A76C6 ΔE2000 9.8

    Noticeable

    Reads as soft blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #00959C ΔE2000 20.2

    Distinct

    Reads as soft cyan

  • Achromatopsia

    No cone color vision; lightness only

    #7D7D7D ΔE2000 22.0

    Distinct

    Reads as gray

Pairing check

Checked against its complement, #B46700. Their lightness contrast is only 1.05:1, so where hue collapses, add a label, icon or pattern.

VisionThe pairΔE2000Verdict
Normal vision#0284C7 · #B4670048.6Stays distinct
Protanopia#6386CA · #7F6F0051.1Stays distinct
Deuteranopia#4A76C6 · #91810154.9Stays distinct
Tritanopia#00959C · #C6555751.2Stays distinct
Achromatopsia#7D7D7D · #7A7A7A1.2Easily confused

Harmony

Color harmonies for #0284C7

Its complement is #B46700, a soft orange, 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#0284C7
  • Complement#B46700

Complementary

Open in Harmony Studio
  • −30°#008CA0
  • Base#0284C7
  • +30°#6075CE

Analogous

Open in Harmony Studio
  • Base#0284C7
  • +120°#BD5476
  • +240°#6F880C

Triadic

Open in Harmony Studio
  • Base#0284C7
  • +150°#C15845
  • +210°#967900

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-sky-600: #0284c7;
}

Tailwind config

// tailwind.config.js — already built in as sky-600;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        sky: { 600: '#0284c7' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own sky-600; this pins the v3 value. */
  --color-sky-600: oklch(0.588 0.139 242.0);
}

Design token (W3C DTCG)

{
  "color": {
    "sky-600": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.0078, 0.5176, 0.7804],
        "hex": "#0284c7"
      },
      "$description": "Tailwind CSS v3 sky-600"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let sky600 = Color(.sRGB, red: 0.008, green: 0.518, blue: 0.780, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Sky600 = Color(0xFF0284C7)
}

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 #0284C7 in the tools

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