#737775

CSS

:root {
  --volcanic-ash: #737775;
  --volcanic-ash-rgb: 115 119 117;
  --volcanic-ash-oklch: oklch(0.565 0.006 164.9);
}

.element {
  color: var(--volcanic-ash);
  background-color: hsl(150 2% 46%);
  border-color: oklch(0.565 0.006 164.9);
}

Tailwind CSS v4

@theme {
  --color-volcanic-ash: #737775;
  --color-volcanic-ash-50: #f4f6f5;
  --color-volcanic-ash-100: #e6e8e7;
  --color-volcanic-ash-200: #d2d5d4;
  --color-volcanic-ash-300: #b5b8b7;
  --color-volcanic-ash-400: #9b9f9d;
  --color-volcanic-ash-500: #838785;
  --color-volcanic-ash-600: #6f7371;
  --color-volcanic-ash-700: #595c5a;
  --color-volcanic-ash-800: #414342;
  --color-volcanic-ash-900: #2d2e2d;
  --color-volcanic-ash-950: #1a1b1a;
}

SCSS

$volcanic-ash: #737775;
$volcanic-ash-rgb: 115, 119, 117;
$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);
}