Shale

CSS

:root {
  --shale: #4a3f41;
  --shale-rgb: 74 63 65;
  --shale-oklch: oklch(0.38 0.016 5.5);
}

.element {
  color: var(--shale);
  background-color: hsl(349 8% 27%);
  border-color: oklch(0.38 0.016 5.5);
}

Tailwind CSS v4

@theme {
  --color-shale: #4a3f41;
  --color-shale-50: #f9f3f4;
  --color-shale-100: #ede6e7;
  --color-shale-200: #dbd2d3;
  --color-shale-300: #bfb4b6;
  --color-shale-400: #a79b9d;
  --color-shale-500: #908285;
  --color-shale-600: #7a6e70;
  --color-shale-700: #61585a;
  --color-shale-800: #474042;
  --color-shale-900: #312c2d;
  --color-shale-950: #1d191a;
}

SCSS

$shale: #4a3f41;
$shale-rgb: 74, 63, 65;
$shale-light: mix(#fff, $shale, 20%);
$shale-dark: mix(#000, $shale, 20%);

.element {
  color: $shale;
  box-shadow: 0 0 0 2px rgba($shale, 0.35);
}