#6E7678

CSS

:root {
  --volcanic-ash: #6e7678;
  --volcanic-ash-rgb: 110 118 120;
  --volcanic-ash-oklch: oklch(0.56 0.01 214.4);
}

.element {
  color: var(--volcanic-ash);
  background-color: hsl(192 4% 45%);
  border-color: oklch(0.56 0.01 214.4);
}

Tailwind CSS v4

@theme {
  --color-volcanic-ash: #6e7678;
  --color-volcanic-ash-50: #f2f6f7;
  --color-volcanic-ash-100: #e4e9ea;
  --color-volcanic-ash-200: #d0d5d7;
  --color-volcanic-ash-300: #b2b9bb;
  --color-volcanic-ash-400: #98a0a2;
  --color-volcanic-ash-500: #7f888a;
  --color-volcanic-ash-600: #6c7375;
  --color-volcanic-ash-700: #565c5e;
  --color-volcanic-ash-800: #3f4344;
  --color-volcanic-ash-900: #2b2e2f;
  --color-volcanic-ash-950: #181b1c;
}

SCSS

$volcanic-ash: #6e7678;
$volcanic-ash-rgb: 110, 118, 120;
$volcanic-ash-light: mix(#fff, $volcanic-ash, 20%);
$volcanic-ash-dark: mix(#000, $volcanic-ash, 20%);

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