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bg-blue-600

Tailwind Blue 600

#2563EB·Blue family·Shade 600

Color Values

HEX
#2563EB
RGB
rgb(37, 99, 235)
HSL
hsl(221, 83%, 53%)
OKLCH
oklch(0.546 0.215 263)
CMYK
cmyk(84%, 58%, 0%, 8%)
CSS Variable
var(--color-blue-600)
Tailwind Class
bg-blue-600

Accessibility Score

60/100

Good

Based on WCAG 2.1 contrast ratios against white and black backgrounds.

On White

5.17:1

AA

On Black

4.06:1

AA Large
Test in Contrast Checker →

Tailwind Usage — All Utilities

Background

bg-blue-600

Text

text-blue-600

Border

border-blue-600

Ring

ring-blue-600

Outline

outline-blue-600

Fill

fill-blue-600

Stroke

stroke-blue-600

From (gradient)

from-blue-600

Via (gradient)

via-blue-600

To (gradient)

to-blue-600

Placeholder

placeholder-blue-600

Caret

caret-blue-600

Accent

accent-blue-600

Decoration

decoration-blue-600

Shadow Color

shadow-blue-600

Tailwind v3 Config (extend custom color)

// tailwind.config.js module.exports = { theme: { extend: { colors: { 'blue-600': '#2563eb', }, }, }, };

CSS Equivalent

/* Hex */
background-color: #2563EB;

/* RGB */
background-color: rgb(37, 99, 235);

/* HSL */
background-color: hsl(221, 83%, 53%);

/* OKLCH (CSS Color Level 4) */
background-color: oklch(0.546 0.215 263);

/* CSS Custom Property (Tailwind v4) */
background-color: var(--color-blue-600);

/* Gradient example */
background: linear-gradient(135deg, #eff6ff 0%, #1d4ed8 100%);

OKLCH — Modern Color Space

Lightness (L)

0.546

55% perceived brightness

Chroma (C)

0.215

Color intensity / saturation

Hue (H)

263°

Angle on perceptual hue wheel

oklch(0.546 0.215 263)

OKLCH is a perceptually uniform color space in CSS Color Level 4. Unlike HSL, equal steps in L produce equal perceived lightness changes — making it ideal for building accessible, harmonious design system scales.

Design Recommendations

Accessible primary action

Shade 600 of the Blue palette

Recommended Uses

  • ✓Primary buttons on white (passes AA)
  • ✓Active state fills
  • ✓Bold text links
  • ✓Form borders on focus
  • ✓Strong icon fills

Avoid

✗Text on dark backgrounds — may fall below required contrast.

Preview

On White

Aa Bb Cc

On Black

Aa Bb Cc

As Background

Aa Bb Cc — #2563EB

Blue Shades

50

100

200

300

400

500

600

700

800

900

950

Similar Tailwind Colors

Perceptually close shades from other Tailwind color families.

Tailwind Sky 700

#0369A1

Tailwind Indigo 600

#4F46E5

Tailwind Sky 600

#0284C7

Tailwind Indigo 500

#6366F1

Tailwind Cyan 700

#0E7490

Tailwind Indigo 700

#4338CA

Nearest Named Color

Tailwind Blue 600

Nearest Tailwind equivalent — #2563EB

Design & Accessibility Guides

Guide

Building an Accessible Color System

Design Systems · 10 min read

Guide

WCAG Contrast Ratios Explained

WCAG · 8 min read

Guide

WCAG AA vs AAA: Which Standard Should You Target?

WCAG · 7 min read

Frequently Asked Questions

What is the hex code for Tailwind Blue 600?
Tailwind Blue 600 has the hex code #2563EB. Its RGB value is rgb(37, 99, 235) and its HSL value is hsl(221, 83%, 53%).
What Tailwind utility classes use Blue 600?
Use bg-blue-600 for backgrounds, text-blue-600 for text color, border-blue-600 for borders, and ring-blue-600 for focus rings. In Tailwind v4 the CSS variable var(--color-blue-600) is available natively.
Is Tailwind Blue 600 WCAG accessible?
Tailwind Blue 600 achieves a 5.17:1 contrast ratio on white (AA) and 4.06:1 on black (AA Large). Its overall accessibility score is 60/100 (Good).
What is the OKLCH value for Tailwind Blue 600?
Tailwind Blue 600 in OKLCH is oklch(0.546 0.215 263) — lightness 0.546, chroma 0.215, hue 263°. OKLCH is a perceptually uniform space supported natively in modern CSS via the `color()` function.
What is Tailwind Blue 600 used for?
At shade 600, Tailwind Blue 600 is best described as "Accessible primary action". Recommended uses: Primary buttons on white (passes AA), Active state fills, Bold text links.
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