CSS named color
Dark Olive Green #556B2F
The CSS keyword darkolivegreen is #556B2F. It is a muted green in the green family. In OKLCH it sits at lightness 0.496, chroma 0.090 and hue 126.2°.
- Relative luminance
- 0.1265
- OKLCH L · C · h
- 0.496 · 0.090 · 126.2
- Best text
- White 5.94:1
- Hue family
- Green
#556B2F color codes
- HEX
#556B2F- RGB
rgb(85, 107, 47)- HSL
hsl(82, 39%, 30%)- OKLCH
oklch(0.496 0.090 126.2)- OKLab
oklab(0.496 -0.053 0.072)- CIELAB (D65)
L* 42.23, a* -18.83, b* 30.60- XYZ (D65)
X 9.52, Y 12.65, Z 4.63- CMYK (naive)
cmyk(21%, 0%, 56%, 58%)
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 #556B2F accessible?
White text on it reaches 5.94:1, passing AA. Black text manages only 3.53:1, 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
3.53:1
- AA fails
- AA large passes
- AAA fails
- APCA Lc +24
-
White text on it
5.94:1
- AA passes
- AA large passes
- AAA fails
- APCA Lc −84
-
As text on black
3.53:1
- AA fails
- AA large passes
- AAA fails
- APCA Lc −22
-
As text on white
5.94:1
- AA passes
- AA large passes
- AAA fails
- APCA Lc +79
Nearest versions that pass 4.5:1
-
For text on white
#556B2F 5.94:1
It already reaches 5.94:1 on white, so no change is needed.
-
For text on black
#667D40 4.57:1
Lightening its OKLCH lightness from 0.50 to 0.56 reaches 4.57:1 on black, keeping the hue.
Checking another pair? Use the Contrast Checker.
Studio
Adjust #556B2F 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.
Scale
Shades and tints of #556B2F
Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #556B2F sits at step 700.
Under each step, white and black text on it; a bold figure passes 4.5:1.
Gamut
How vivid #556B2F can get
At its lightness and hue, sRGB reaches OKLCH chroma 0.127; #556B2F uses 71% of it. Display P3, which many recent phones and laptops show, reaches 0.148 there: 17% more.
- sRGB
- Display P3
- Rec. 2020
- Dominant wavelength
- OKLCH chroma
- 0.090
- sRGB edge
- 0.127
- Display P3 edge
- 0.148
- Rec. 2020 edge
- 0.153
- Dominant wavelength
- 563 nm
- Excitation purity
- 52%
- Chromaticity
- x 0.3551, y 0.4721
- This color#556B2F
- Most vivid in sRGB#506E00
- Most vivid in Display P3oklch(0.496 0.148 126.2)
On a screen without Display P3 the last tile shows the sRGB edge instead.
.accent {
color: #556b2f;
}
@media (color-gamut: p3) {
.accent { color: color(display-p3 0.3296 0.4328 0); }
}Mixing
Mixing #556B2F
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%#AAB597
- OKLab50%#A6B394
- OKLCH50%#A6B394
Black #000000
- sRGB50%#2B3618
- OKLab50%#1C250C
- OKLCH50%#1C250C
Its complement #6F548A
- sRGB50%#62605D
- OKLab50%#626262
- OKLCH50%#8D4E3D
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #556b2f, white);
color: color-mix(in oklch, #556b2f 50%, white);In use
#556B2F 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, 4.5:15.94:1 Passes
- Link and body-size textText, 4.5:15.94:1 Passes
- Large headingLarge text, 3:15.94:1 Passes
- Icons, borders and focus ringsNon-text, 3:15.94:1 Passes
Dark page
- Button labelText, 4.5:15.94:1 Passes
- Link and body-size textText, 4.5:13.14:1 Fails
- Large headingLarge text, 3:13.14:1 Passes
- Icons, borders and focus ringsNon-text, 3:13.14:1 Passes
For text on this page, the nearest shade that passes is #6E8649 4.61:1
Color vision
How #556B2F looks with color blindness
Achromatopsia changes it most, ΔE2000 21.0; deuteranopia changes it least, 10.7.
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
#706529 ΔE2000 10.9
Distinct
Reads as muted brown
-
Deuteranopia
No working green (medium-wavelength) cones
#6D6333 ΔE2000 10.7
Distinct
Reads as muted brown
-
Tritanopia
No working blue (short-wavelength) cones
#58665E ΔE2000 16.1
Distinct
Reads as grayish green
-
Achromatopsia
No cone color vision; lightness only
#646464 ΔE2000 21.0
Distinct
Reads as gray
Pairing check
Checked against its complement, #6F548A. Their lightness contrast is only 1.06:1, so where hue collapses, add a label, icon or pattern.
| Vision | The pair | ΔE2000 | Verdict |
|---|---|---|---|
| Normal vision | #556B2F · #6F548A | 50.7 | Stays distinct |
| Protanopia | #706529 · #485E8C | 40.7 | Stays distinct |
| Deuteranopia | #6D6333 · #4E6088 | 36.4 | Stays distinct |
| Tritanopia | #58665E · #6B5C68 | 19.5 | Stays distinct |
| Achromatopsia | #646464 · #5F5F5F | 1.8 | Easily confused |
Harmony
Color harmonies for #556B2F
Its complement is #6F548A, a muted violet.
Hue rotations in OKLCH, mapped into sRGB by trimming chroma so hue and lightness stay put.
Open the Harmony Studio- Base#556B2F
- Complement#6F548A
Complementary
Open in Harmony Studio- −30°#71611B
- Base#556B2F
- +30°#30714C
Analogous
Open in Harmony Studio- Base#556B2F
- +120°#326692
- +240°#8C4B5A
Triadic
Open in Harmony Studio- Base#556B2F
- +150°#545D95
- +210°#824D75
Split-complementary
Open in Harmony StudioCode
Design tokens
Ready-to-paste tokens in six formats. Rename them to fit your system.
:root {
--color-darkolivegreen: #556b2f;
}// tailwind.config.js
module.exports = {
theme: {
extend: {
colors: {
darkolivegreen: '#556b2f',
},
},
},
};/* app.css — Tailwind CSS v4 */
@import "tailwindcss";
@theme {
--color-darkolivegreen: oklch(0.496 0.090 126.2);
}{
"color": {
"darkolivegreen": {
"$type": "color",
"$value": {
"colorSpace": "srgb",
"components": [0.3333, 0.4196, 0.1843],
"hex": "#556b2f"
},
"$description": "CSS named color darkolivegreen"
}
}
}import SwiftUI
enum Palette {
static let darkolivegreen = Color(.sRGB, red: 0.333, green: 0.420, blue: 0.184, opacity: 1)
}import androidx.compose.ui.graphics.Color
object Palette {
val Darkolivegreen = Color(0xFF556B2F)
}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.
Tools
Open #556B2F in the tools
Each opens over this page. More colors live in the Color Library, and every color page is listed on the hub.
- Color InspectorEvery format, its names, contrast and color vision in one panel.
- Contrast SystemBlack and white text on this color, with fixes in both directions.
- Harmony StudioPalettes built from this color, walked to a contrast target if you ask.
- Color Space ConverterThe same color in 34 notations, with its gamut headroom.
- Color Name FinderThe nearest of 1,055 color names by ΔE2000.