Tailwind CSS v3 color

Tailwind blue-700 #1D4ED8

Tailwind CSS v3's blue-700 is #1D4ED8. It is a vivid blue in the blue family. In OKLCH it sits at lightness 0.488, chroma 0.217 and hue 264.4°. The nearest CSS named color is royalblue (#4169E1), ΔE2000 8.8 away.

Relative luminance
0.1067
OKLCH L · C · h
0.488 · 0.217 · 264.4
Best text
White 6.70:1
Hue family
Blue
Inspect this color Check contrast

#1D4ED8 color codes

HEX
#1D4ED8
RGB
rgb(29, 78, 216)
HSL
hsl(224, 76%, 48%)
OKLCH
oklch(0.488 0.217 264.4)
OKLab
oklab(0.488 -0.021 -0.216)
CIELAB (D65)
L* 39.01, a* 36.76, b* -74.57
XYZ (D65)
X 15.62, Y 10.67, Z 66.19
CMYK (naive)
cmyk(87%, 64%, 0%, 15%)

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 #1D4ED8 accessible?

White text on it reaches 6.70:1, passing AA. Black text manages only 3.13:1, 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

    3.13:1

    • AA fails
    • AA large passes
    • AAA fails
    • APCA Lc +21

  • White text on it

    6.70:1

    • AA passes
    • AA large passes
    • AAA fails
    • APCA Lc −87

  • As text on black

    3.13:1

    • AA fails
    • AA large passes
    • AAA fails
    • APCA Lc −19

  • As text on white

    6.70:1

    • AA passes
    • AA large passes
    • AAA fails
    • APCA Lc +82

Nearest versions that pass 4.5:1

  • For text on white

    #1D4ED8 6.70:1

    It already reaches 6.70:1 on white, so no change is needed.

  • For text on black

    #346AF6 4.53:1

    Lightening its OKLCH lightness from 0.49 to 0.57 reaches 4.53:1 on black, keeping the hue.

    Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #1D4ED8 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 #1D4ED8

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #1D4ED8 sits at step 700.

  1. 50#F0F5FF
    White
    1.09
    Black
    19.21
  2. 100#E2EBFF
    White
    1.19
    Black
    17.56
  3. 200#C4D8FF
    White
    1.43
    Black
    14.61
  4. 300#9DBDFF
    White
    1.88
    Black
    11.15
  5. 400#729EFF
    White
    2.60
    Black
    8.05
  6. 500#457BFF
    White
    3.79
    Black
    5.53
  7. 600#2B60E9
    White
    5.31
    Black
    3.95
  8. 700This color#1D4ED8
    White
    6.70
    Black
    3.13
  9. 800#0629A6
    White
    11.19
    Black
    1.87
  10. 900#010981
    White
    15.47
    Black
    1.35
  11. 950#000053
    White
    18.66
    Black
    1.12

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

Tailwind CSS v3 blue scale

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

  1. 50#EFF6FF
    White
    1.08
    Black
    19.29
  2. 100#DBEAFE
    White
    1.22
    Black
    17.21
  3. 200#BFDBFE
    White
    1.42
    Black
    14.77
  4. 300#93C5FD
    White
    1.80
    Black
    11.64
  5. 400#60A5FA
    White
    2.54
    Black
    8.25
  6. 500#3B82F6
    White
    3.67
    Black
    5.70
  7. 600#2563EB
    White
    5.16
    Black
    4.06
  8. 700This color#1D4ED8
    White
    6.70
    Black
    3.13
  9. 800#1E40AF
    White
    8.72
    Black
    2.40
  10. 900#1E3A8A
    White
    10.35
    Black
    2.02
  11. 950#172554
    White
    14.69
    Black
    1.42

Gamut

How vivid #1D4ED8 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.289; #1D4ED8 uses 75% of it. Display P3, which many recent phones and laptops show, reaches 0.308 there: 7% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.217
sRGB edge
0.289
Display P3 edge
0.308
Rec. 2020 edge
0.312
Dominant wavelength
469 nm
Excitation purity
77%
Chromaticity
x 0.1689, y 0.1153
  • This color#1D4ED8
  • Most vivid in sRGB#0535FF
  • Most vivid in Display P3oklch(0.488 0.308 264.4)

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

Use the wider color where screens show it
.accent {
  color: #1d4ed8;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.0592 0.1597 1); }
}

Mixing

Mixing #1D4ED8

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%#8EA7EC
  • OKLab50%#8AABF1
  • OKLCH50%#8AABF1

Black #000000

  • sRGB50%#0F276C
  • OKLab50%#051953
  • OKLCH50%#051953

Its complement #7A5A00

  • sRGB50%#4C546C
  • OKLab50%#4F6082
  • OKLCH50%#00705C
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #1d4ed8, white);
color: color-mix(in oklch, #1d4ed8 50%, white);

In use

#1D4ED8 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, 4.5:16.70:1 Passes
  • Link and body-size textText, 4.5:16.70:1 Passes
  • Large headingLarge text, 3:16.70:1 Passes
  • Icons, borders and focus ringsNon-text, 3:16.70:1 Passes

Dark page

  • Button labelText, 4.5:16.70:1 Passes
  • Link and body-size textText, 4.5:12.79:1 Fails
  • Large headingLarge text, 3:12.79:1 Fails
  • Icons, borders and focus ringsNon-text, 3:12.79:1 Fails

For text on this page, the nearest shade that passes is #3D74FF 4.58:1

Color vision

How #1D4ED8 looks with color blindness

Achromatopsia changes it most, ΔE2000 29.0; deuteranopia changes it least, 2.3.

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

    #0065DC ΔE2000 8.1

    Noticeable

    Reads as vivid blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #0053D5 ΔE2000 2.3

    Close match

    Reads as vivid blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #00738C ΔE2000 21.2

    Distinct

    Reads as muted blue

  • Achromatopsia

    No cone color vision; lightness only

    #5C5C5C ΔE2000 29.0

    Distinct

    Reads as dark gray

Pairing check

Checked against its complement, #7A5A00. Their lightness contrast is only 1.04:1, so where hue collapses, add a label, icon or pattern.

VisionThe pairΔE2000Verdict
Normal vision#1D4ED8 · #7A5A0057.8Stays distinct
Protanopia#0065DC · #685A0057.9Stays distinct
Deuteranopia#0053D5 · #6F620760.6Stays distinct
Tritanopia#00738C · #86504C44.7Stays distinct
Achromatopsia#5C5C5C · #5F5F5F1.1Easily confused

Harmony

Color harmonies for #1D4ED8

Its complement is #7A5A00, a soft 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#1D4ED8
  • Complement#7A5A00

Complementary

Open in Harmony Studio
  • −30°#006891
  • Base#1D4ED8
  • +30°#6D33CB

Analogous

Open in Harmony Studio
  • Base#1D4ED8
  • +120°#B6001E
  • +240°#007518

Triadic

Open in Harmony Studio
  • Base#1D4ED8
  • +150°#934900
  • +210°#5F6600

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-blue-700: #1d4ed8;
}

Tailwind config

// tailwind.config.js — already built in as blue-700;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        blue: { 700: '#1d4ed8' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own blue-700; this pins the v3 value. */
  --color-blue-700: oklch(0.488 0.217 264.4);
}

Design token (W3C DTCG)

{
  "color": {
    "blue-700": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.1137, 0.3059, 0.8471],
        "hex": "#1d4ed8"
      },
      "$description": "Tailwind CSS v3 blue-700"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let blue700 = Color(.sRGB, red: 0.114, green: 0.306, blue: 0.847, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Blue700 = Color(0xFF1D4ED8)
}

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 #1D4ED8 in the tools

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