Accessibility
Vs white / black
18.35:1 · 1.14:1
Sources
Codes
HEX
#21100d
RGB
rgb(33, 16, 13)
RGBA
rgba(33, 16, 13, 1)
HSL
hsl(9, 43%, 9%)
HSV
hsv(9, 61%, 13%)
LAB
lab(6.53% 8.08 4.49)
LCH
lch(6.53% 9.24 29.06)
OKLAB
oklab(0.1966 0.0255 0.0151)
OKLCH
oklch(0.1966 0.0296 30.63)
XYZ
xyz(0.89, 0.72, 0.47)
CMYK
cmyk(0%, 52%, 61%, 87%)
CSS
color: #21100d;
CSS variable
--color-21100d: #21100d;
SCSS
$color-21100d: #21100d;
Tailwind
slate-900
Export
:root {
--#21100d-1: #21100d;
}Palette
Full scale from light tints through the base color into deep shades
Palette
Mixed toward white — soft backgrounds and highlights
Palette
Mixed toward black — depth, text, and emphasis
Palette
Mixed toward neutral grey — muted UI surfaces
Harmony
Opposite on the color wheel for contrast
Harmony
Neighbors that sit comfortably together
Harmony
Evenly spaced triad for vibrant sets
Harmony
Base plus two accents beside the complement
Harmony
Same hue, varied lightness and saturation
Meaning
Energy, urgency, passion, and excitement. Often used for CTAs, alerts, and brands that want attention.
Common uses: primary buttons, chart series, status badges, marketing gradients, and brand accents in the Red family.
Related
Nearby colors from the library by perceptual distance