#707579

CSS

:root {
  --volcanic-ash: #707579;
  --volcanic-ash-rgb: 112 117 121;
  --volcanic-ash-oklch: oklch(0.559 0.009 241.8);
}

.element {
  color: var(--volcanic-ash);
  background-color: hsl(207 4% 46%);
  border-color: oklch(0.559 0.009 241.8);
}

Tailwind CSS v4

@theme {
  --color-volcanic-ash: #707579;
  --color-volcanic-ash-50: #f3f5f7;
  --color-volcanic-ash-100: #e5e8ea;
  --color-volcanic-ash-200: #d1d5d8;
  --color-volcanic-ash-300: #b4b8bb;
  --color-volcanic-ash-400: #9a9fa3;
  --color-volcanic-ash-500: #81878b;
  --color-volcanic-ash-600: #6d7276;
  --color-volcanic-ash-700: #585b5e;
  --color-volcanic-ash-800: #404345;
  --color-volcanic-ash-900: #2c2e30;
  --color-volcanic-ash-950: #191b1c;
}

SCSS

$volcanic-ash: #707579;
$volcanic-ash-rgb: 112, 117, 121;
$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);
}