#717579

CSS

:root {
  --volcanic-ash: #717579;
  --volcanic-ash-rgb: 113 117 121;
  --volcanic-ash-oklch: oklch(0.56 0.008 248);
}

.element {
  color: var(--volcanic-ash);
  background-color: hsl(210 3% 46%);
  border-color: oklch(0.56 0.008 248);
}

Tailwind CSS v4

@theme {
  --color-volcanic-ash: #717579;
  --color-volcanic-ash-50: #f3f5f7;
  --color-volcanic-ash-100: #e6e8ea;
  --color-volcanic-ash-200: #d2d4d7;
  --color-volcanic-ash-300: #b4b8bb;
  --color-volcanic-ash-400: #9b9fa3;
  --color-volcanic-ash-500: #82878b;
  --color-volcanic-ash-600: #6e7276;
  --color-volcanic-ash-700: #585b5e;
  --color-volcanic-ash-800: #404345;
  --color-volcanic-ash-900: #2c2e30;
  --color-volcanic-ash-950: #191b1c;
}

SCSS

$volcanic-ash: #717579;
$volcanic-ash-rgb: 113, 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);
}