Tailwind CSS v4 default palette
Tailwind emerald-900: #004F3B
In Tailwind CSS v4, emerald-900 is defined as --color-emerald-900: oklch(37.8% 0.077 168.94), which is #004F3B in hex and rgb(0, 79, 59): a dark, muted green-cyan. In Tailwind v3, emerald-900 was #064E3B.
In OKLCH, emerald-900 has a lightness of 37.8%, chroma 0.077 and hue 168.9°.
This OKLCH value lies outside sRGB. The hex #004F3B is the sRGB fallback from the CSS Color 4 gamut mapping algorithm; on Display P3 screens browsers show a more saturated color, close to color(display-p3 0.1178 0.303 0.2345).
In v3, emerald-900 was #064E3B. The v4 value is ΔE OK 0.4 away, below the point where most people can tell them apart.
Tailwind emerald is a cooler, slightly bluer green than green, common for success states in finance and health products.
Color codes for emerald-900
| Tailwind v4 token | --color-emerald-900 |
|---|---|
| OKLCH (source value) | oklch(37.8% 0.077 168.94) |
| HEX | #004F3B |
| RGB | rgb(0, 79, 59) |
| HSL | hsl(165, 100%, 15%) |
| HWB | hwb(165 0% 69%) |
| CMYK (naive, no ICC profile) | cmyk(100%, 0%, 25%, 69%) |
| Decimal | 20,283 |
| Display P3 | color(display-p3 0.1178 0.303 0.2345) |
| Tailwind v3 hex | #064E3B |
| Utility classes | bg-emerald-900, text-emerald-900, border-emerald-900 |
Tailwind emerald scale
Contrast and accessibility
On emerald-900, white text has a contrast ratio of 9.62:1 and passes AAA at any text size; black text reaches 2.18:1.
WCAG 2.2 contrast ratios (success criteria 1.4.3 and 1.4.6: AA needs 4.5:1 for normal text and 3:1 for large text, AAA needs 7:1 and 4.5:1). APCA Lc is the lightness contrast from the APCA-W3 0.0.98G model proposed for WCAG 3; a higher absolute value is more readable, and Lc 75 is its suggested minimum for body text.
| Pair | Ratio | AA | AA large | AAA | AAA large | APCA Lc |
|---|---|---|---|---|---|---|
| Black text on emerald-900 | 2.18:1 | Fail | Fail | Fail | Fail | 12.1 |
| White text on emerald-900 | 9.62:1 | Pass | Pass | Pass | Pass | −96.1 |
| Emerald-900 text on white | 9.62:1 | Pass | Pass | Pass | Pass | 91.8 |
| Emerald-900 text on black | 2.18:1 | Fail | Fail | Fail | Fail | −10.6 |
Tints and shades
Each step mixes var(--color-emerald-900) with white (tints) or black (shades) in gamma-encoded sRGB, the same result as color-mix(in srgb, var(--color-emerald-900), white 25%) in CSS.
Tints (mixed with white)
- 5%
#0d5845 - 15%
#266958 - 25%
#407b6c - 35%
#598d80 - 45%
#739e93 - 55%
#8cb0a7 - 65%
#a6c1ba - 75%
#bfd3ce - 85%
#d9e5e2 - 95%
#f2f6f5
Shades (mixed with black)
- 5%
#004b38 - 15%
#004332 - 25%
#003b2c - 35%
#003326 - 45%
#002b20 - 55%
#00241b - 65%
#001c15 - 75%
#00140f - 85%
#000c09 - 95%
#000403
Color harmonies
Rotating the hue in OKLCH while keeping lightness and chroma, emerald-900's complementary color is #5F2F48 (close to maroon), its analogous colors are #2B4B22 and #004E51, and its triadic partners are #413A68 and #623419. For text on top, white gives the higher contrast.
| Harmony | Rotation | Color |
|---|---|---|
| Complementary | +180° | #5f2f48 |
| Analogous | −30°, +30° | #2b4b22#004e51 |
| Triadic | +120°, +240° | #413a68#623419 |
| Split-complementary | +150°, +210° | #53345c#652f31 |
Computed in OKLCH: the hue is rotated by 180° (complementary), ±30° (analogous), ±120° (triadic) and 180° ±30° (split-complementary) while lightness and chroma stay fixed. Results that fall outside sRGB are brought back with the CSS Color 4 gamut mapping algorithm. Because this uses OKLCH, the values differ from tools that rotate hue in HSL, but every color keeps the same perceived lightness.
Warm or cool?
Tailwind emerald-900 is a cool color: its hue is 165° on the HSL wheel, in the green, blue and violet range that is conventionally called cool.
Nearest named and Tailwind colors
Distance is ΔE OK, the Euclidean distance in OKLab multiplied by 100. Values under about 2 are hard to tell apart side by side.
Nearest CSS named colors
| Color | HEX | ΔE OK |
|---|---|---|
| darkslategray | #2f4f4f | 5.3 |
| darkgreen | #006400 | 10.4 |
| darkolivegreen | #556b2f | 13.3 |
Nearest Tailwind v4 colors
| Color | HEX | ΔE OK |
|---|---|---|
| teal-900 | #0b4f4a | 2.9 |
| green-900 | #0d542b | 3.4 |
| emerald-800 | #006045 | 5.7 |
Code snippets
<div class="bg-emerald-900 text-white">...</div>
<p class="text-emerald-900 border-emerald-900">...</p>.element {
color: var(--color-emerald-900);
background-color: oklch(37.8% 0.077 168.94);
border-color: #004f3b;
outline-color: rgb(0 79 59);
}import SwiftUI
extension Color {
static let emerald900 = Color(red: 0.000, green: 0.310, blue: 0.231)
}import androidx.compose.ui.graphics.Color
val Emerald900 = Color(0xFF004F3B)import 'package:flutter/material.dart';
const emerald900 = Color(0xFF004F3B);<!-- res/values/colors.xml -->
<color name="emerald_900">#004F3B</color>Frequently asked questions
- What is the hex code for Tailwind emerald-900?
- In Tailwind CSS v4, emerald-900 is oklch(37.8% 0.077 168.94), which converts to #004F3B (rgb(0, 79, 59)) in sRGB after gamut mapping, because the OKLCH value is outside sRGB. In Tailwind v3 the same name was #064E3B.
- What is the difference between emerald-900 in Tailwind v3 and v4?
- v3 used the hex #064E3B; v4 redefined the palette in OKLCH as oklch(37.8% 0.077 168.94). In v3, emerald-900 was #064E3B. The v4 value is ΔE OK 0.4 away, below the point where most people can tell them apart.
- How do I use emerald-900 in plain CSS?
- Tailwind v4 defines every palette color as a theme variable, so in CSS you write var(--color-emerald-900). By default Tailwind only emits the variables your project uses; @theme static emits all of them.
- Can you use white text on emerald-900?
- White text on emerald-900 has a contrast ratio of 9.62:1, which passes both AA and AAA under WCAG 2.2. Black text reaches 2.18:1 and fails AA even for large text. In APCA terms that is Lc −96.1 for white and Lc 12.1 for black.
- Which CSS named color is closest to emerald-900?
- The closest is darkslategray (#2F4F4F) at ΔE OK 5.3, followed by darkgreen and darkolivegreen.
Last reviewed by Arielton Oberek.