Donkey Brown (#664C28) is a muted, dark brown. In RGB it is made of 40% red, 30% green and 16% blue (R 102, G 76, B 40). The red channel is the strongest. In HSL it has a hue of 35Β°, 44% saturation and 28% lightness. Its relative luminance is 0.081, so white text is easier to read on top of it. For print, a rough CMYK match is 0% cyan, 25% magenta, 61% yellow and 60% black. Check it against your printer's ICC profile before you print. It is a warm color. It goes well with cool blues and greens for contrast. For a matching look, use nearby warm tones.
#664C28 in every common color format. Click a value to copy it.
| Format | Value | Copy |
|---|---|---|
| HEX | #664C28 | |
| RGB | rgb(102, 76, 40) | |
| HSL | hsl(35, 44%, 28%) | |
| HSV / HSB | hsv(35, 61%, 40%) | |
| HWB | hwb(35 16% 60%) | |
| CMYK | cmyk(0%, 25%, 61%, 60%) | |
| OKLCH | oklch(43.59% 0.0624 73.87) | |
| OKLab | oklab(43.59% 0.0173 0.06) | |
| CIELAB | lab(34.53% 7.99 25.6) | |
| CIELCH | lch(34.53% 26.82 72.66) | |
| Display P3 | color(display-p3 0.3843 0.3021 0.1786) | |
| XYZ (D65) | color(xyz-d65 0.0845 0.0815 0.0314) | |
| Decimal | 6704168 |
CMYK here is a rough screen match without an ICC profile. See CMYK and print. Relative luminance: 0.0815. Nearest web-safe color: #663333.
See what #664C28 makes with red paint, under a green light, printed with cyan ink and in a digital blend with blue. Click a picture to change the colors and amounts in the color mixer.
Ready to paste into CSS, Sass, Tailwind, iOS, Android and Flutter. Click the icon to copy a line.
| Where | Code | Copy |
|---|---|---|
| CSS variable | --donkey-brown: #664C28; | |
| Sass variable | $donkey-brown: #664C28; | |
| Tailwind CSS v4 | @theme { --color-donkey-brown: #664C28; } | |
| Tailwind CSS v3 config | colors: { 'donkey-brown': '#664C28' } | |
| SwiftUI | Color(red: 0.4, green: 0.298, blue: 0.157) | |
| UIKit | UIColor(red: 0.4, green: 0.298, blue: 0.157, alpha: 1) | |
| Android XML | <color name="donkey_brown">#FF664C28</color> | |
| Flutter and Jetpack Compose | Color(0xFF664C28) |
White text works best on #664C28 (7.99:1, AAA). Here is how #664C28 does as a text color:
Check this color against any background in the contrast checker. WCAG ratios and APCA Lc values measure different things, so one can't stand in for the other. Learn more.
#664C28 next to its complement and its two triadic colors, as seen with each type of color blindness.
With protanopia and deuteranopia, #664C28 and #28664C look much alike. Don't use these colors alone to tell things apart, for example in a chart. Add labels, patterns or a difference in lightness. Try your own colors in the color blindness simulator.
Donkey brown, #664C28, is a dark, warm brown. The name comes from online color lists, and we found no paint maker or color standard behind this code. Other sites use the same name for much lighter tan colors, such as #A69279, so the name alone does not pin down one shade.
This code is only a few steps away from Van Dyke brown, #664228 on this site. That pigment is named after the painter Anthony van Dyck. For more dark browns, see our shades of brown.
A sample app screen with #664C28 as the main color, on a light and a dark theme.
Light theme
Dark theme
Buttons and bars use #664C28 as it is. On the dark theme, #664C28 is too hard to read as text (2.22:1), so links, the badge and outline text use #987C57 there (4.53:1). Build a full color scheme around it in the UI color preview.
These schemes turn the hue of #664C28 around the color wheel. Each swatch links to its own page.
Two colors on opposite sides of the wheel. This gives the most contrast.
Hues that sit next to each other and look good together.
Three hues spaced evenly around the wheel. Bold, but still balanced.
A base color plus the two hues on each side of its opposite. Strong contrast that clashes less.
Two pairs of opposite colors. Let one color lead and use the others less.
Four hues 90Β° apart, spread evenly around the wheel.
One hue at different levels of lightness and saturation.
Four CSS gradients made from #664C28. Copy the code, or open one in the gradient generator to change it.
From a pale tint to the full color.
background: linear-gradient(90deg, #DFD9D1, #664C28);
The color fading into a dark shade.
background: linear-gradient(180deg, #664C28, #170F04);
Its two neighbors on the color wheel.
background: linear-gradient(135deg, #662D28, #664C28, #616628);
A bold blend with a triadic color, through a clean middle.
background: linear-gradient(135deg, #664C28, #4F5A3B, #28664C);
Shades are darker, tints are lighter and tones are grayer. We make them in OKLCH so the steps look even. Hover a step to see its code, or click it to open it.
Donkey Brown sits at step 700. Export the full scale as CSS variables or Tailwind tokens from the picker.
The nearest match to #664C28 in three color systems that designers and builders use.
ΞE is the distance in OKLab: under 2 is hard to see, over 10 is a clearly different color. Browse all RAL colors, the Tailwind palette or the 148 CSS color names. RAL values on screens are only a guide, so check a real color chart before you order paint.
The named colors that look closest to this one (ΞE in OKLab). Browse all shades of brown or search the color library.
