#6E6C6B

CSS

:root {
  --volcanic-rock: #6e6c6b;
  --volcanic-rock-rgb: 110 108 107;
  --volcanic-rock-oklch: oklch(0.533 0.003 48.7);
}

.element {
  color: var(--volcanic-rock);
  background-color: hsl(20 1% 43%);
  border-color: oklch(0.533 0.003 48.7);
}

Tailwind CSS v4

@theme {
  --color-volcanic-rock: #6e6c6b;
  --color-volcanic-rock-50: #f6f5f4;
  --color-volcanic-rock-100: #e9e7e7;
  --color-volcanic-rock-200: #d5d4d3;
  --color-volcanic-rock-300: #b9b7b6;
  --color-volcanic-rock-400: #a09e9d;
  --color-volcanic-rock-500: #888684;
  --color-volcanic-rock-600: #737170;
  --color-volcanic-rock-700: #5c5a5a;
  --color-volcanic-rock-800: #434241;
  --color-volcanic-rock-900: #2e2e2d;
  --color-volcanic-rock-950: #1b1a1a;
}

SCSS

$volcanic-rock: #6e6c6b;
$volcanic-rock-rgb: 110, 108, 107;
$volcanic-rock-light: mix(#fff, $volcanic-rock, 20%);
$volcanic-rock-dark: mix(#000, $volcanic-rock, 20%);

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