Skip to main content

bg-blue-800

Tailwind Blue 800

#1E40AF·Blue family·Shade 800

Color Values

HEX
#1E40AF
RGB
rgb(30, 64, 175)
HSL
hsl(226, 71%, 40%)
OKLCH
oklch(0.424 0.181 266)
CMYK
cmyk(83%, 63%, 0%, 31%)
CSS Variable
var(--color-blue-800)
Tailwind Class
bg-blue-800

Accessibility Score

60/100

Good

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

On White

8.72:1

AAA

On Black

2.41:1

Fail
Test in Contrast Checker →

Tailwind Usage — All Utilities

Background

bg-blue-800

Text

text-blue-800

Border

border-blue-800

Ring

ring-blue-800

Outline

outline-blue-800

Fill

fill-blue-800

Stroke

stroke-blue-800

From (gradient)

from-blue-800

Via (gradient)

via-blue-800

To (gradient)

to-blue-800

Placeholder

placeholder-blue-800

Caret

caret-blue-800

Accent

accent-blue-800

Decoration

decoration-blue-800

Shadow Color

shadow-blue-800

Tailwind v3 Config (extend custom color)

// tailwind.config.js module.exports = { theme: { extend: { colors: { 'blue-800': '#1e40af', }, }, }, };

CSS Equivalent

/* Hex */
background-color: #1E40AF;

/* RGB */
background-color: rgb(30, 64, 175);

/* HSL */
background-color: hsl(226, 71%, 40%);

/* OKLCH (CSS Color Level 4) */
background-color: oklch(0.424 0.181 266);

/* CSS Custom Property (Tailwind v4) */
background-color: var(--color-blue-800);

/* Gradient example */
background: linear-gradient(135deg, #eff6ff 0%, #1e3a8a 100%);

OKLCH — Modern Color Space

Lightness (L)

0.424

42% perceived brightness

Chroma (C)

0.181

Color intensity / saturation

Hue (H)

266°

Angle on perceptual hue wheel

oklch(0.424 0.181 266)

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

Deep tone for text & UI

Shade 800 of the Blue palette

Recommended Uses

  • ✓Heading text on white
  • ✓Icon fills on light backgrounds
  • ✓Dark sidebar fills
  • ✓Strong badge colors
  • ✓Section dividers

Avoid

✗On colored or dark backgrounds — check contrast ratio first.

Preview

On White

Aa Bb Cc

On Black

Aa Bb Cc

As Background

Aa Bb Cc — #1E40AF

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 Indigo 800

#3730A3

Tailwind Indigo 700

#4338CA

Tailwind Indigo 900

#312E81

Tailwind Sky 900

#0C4A6E

Tailwind Sky 800

#075985

Tailwind Cyan 900

#164E63

Nearest Named Color

Tailwind Blue 800

Nearest Tailwind equivalent — #1E40AF

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 800?
Tailwind Blue 800 has the hex code #1E40AF. Its RGB value is rgb(30, 64, 175) and its HSL value is hsl(226, 71%, 40%).
What Tailwind utility classes use Blue 800?
Use bg-blue-800 for backgrounds, text-blue-800 for text color, border-blue-800 for borders, and ring-blue-800 for focus rings. In Tailwind v4 the CSS variable var(--color-blue-800) is available natively.
Is Tailwind Blue 800 WCAG accessible?
Tailwind Blue 800 achieves a 8.72:1 contrast ratio on white (AAA) and 2.41:1 on black (Fail). Its overall accessibility score is 60/100 (Good).
What is the OKLCH value for Tailwind Blue 800?
Tailwind Blue 800 in OKLCH is oklch(0.424 0.181 266) — lightness 0.424, chroma 0.181, hue 266°. OKLCH is a perceptually uniform space supported natively in modern CSS via the `color()` function.
What is Tailwind Blue 800 used for?
At shade 800, Tailwind Blue 800 is best described as "Deep tone for text & UI". Recommended uses: Heading text on white, Icon fills on light backgrounds, Dark sidebar fills.
← All Tailwind Colors