Hard Coal

CSS

:root {
  --hard-coal: #656464;
  --hard-coal-rgb: 101 100 100;
  --hard-coal-oklch: oklch(0.504 0.001 17.2);
}

.element {
  color: var(--hard-coal);
  background-color: hsl(0 0% 39%);
  border-color: oklch(0.504 0.001 17.2);
}

Tailwind CSS v4

@theme {
  --color-hard-coal: #656464;
  --color-hard-coal-50: #f5f5f5;
  --color-hard-coal-100: #e8e8e8;
  --color-hard-coal-200: #d5d4d4;
  --color-hard-coal-300: #b8b7b7;
  --color-hard-coal-400: #9f9e9e;
  --color-hard-coal-500: #878686;
  --color-hard-coal-600: #727171;
  --color-hard-coal-700: #5b5a5a;
  --color-hard-coal-800: #434242;
  --color-hard-coal-900: #2e2e2e;
  --color-hard-coal-950: #1b1a1a;
}

SCSS

$hard-coal: #656464;
$hard-coal-rgb: 101, 100, 100;
$hard-coal-light: mix(#fff, $hard-coal, 20%);
$hard-coal-dark: mix(#000, $hard-coal, 20%);

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