#6F6C66

CSS

:root {
  --volcanic-rock: #6f6c66;
  --volcanic-rock-rgb: 111 108 102;
  --volcanic-rock-oklch: oklch(0.532 0.01 84.6);
}

.element {
  color: var(--volcanic-rock);
  background-color: hsl(40 4% 42%);
  border-color: oklch(0.532 0.01 84.6);
}

Tailwind CSS v4

@theme {
  --color-volcanic-rock: #6f6c66;
  --color-volcanic-rock-50: #f6f5f2;
  --color-volcanic-rock-100: #e9e8e4;
  --color-volcanic-rock-200: #d6d4cf;
  --color-volcanic-rock-300: #b9b7b2;
  --color-volcanic-rock-400: #a19e98;
  --color-volcanic-rock-500: #89867f;
  --color-volcanic-rock-600: #74716b;
  --color-volcanic-rock-700: #5d5a56;
  --color-volcanic-rock-800: #44423f;
  --color-volcanic-rock-900: #2f2e2b;
  --color-volcanic-rock-950: #1c1a18;
}

SCSS

$volcanic-rock: #6f6c66;
$volcanic-rock-rgb: 111, 108, 102;
$volcanic-rock-light: mix(#fff, $volcanic-rock, 20%);
$volcanic-rock-dark: mix(#000, $volcanic-rock, 20%);

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