#737779

CSS

:root {
  --volcanic-ash: #737779;
  --volcanic-ash-rgb: 115 119 121;
  --volcanic-ash-oklch: oklch(0.566 0.006 228.9);
}

.element {
  color: var(--volcanic-ash);
  background-color: hsl(200 3% 46%);
  border-color: oklch(0.566 0.006 228.9);
}

Tailwind CSS v4

@theme {
  --color-volcanic-ash: #737779;
  --color-volcanic-ash-50: #f3f5f6;
  --color-volcanic-ash-100: #e6e8e9;
  --color-volcanic-ash-200: #d2d5d6;
  --color-volcanic-ash-300: #b4b8ba;
  --color-volcanic-ash-400: #9b9fa1;
  --color-volcanic-ash-500: #828789;
  --color-volcanic-ash-600: #6e7274;
  --color-volcanic-ash-700: #585b5d;
  --color-volcanic-ash-800: #404344;
  --color-volcanic-ash-900: #2c2e2f;
  --color-volcanic-ash-950: #191b1b;
}

SCSS

$volcanic-ash: #737779;
$volcanic-ash-rgb: 115, 119, 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);
}