#060604

CSS

:root {
  --black-metal: #060604;
  --black-metal-rgb: 6 6 4;
  --black-metal-oklch: oklch(0.121 0.007 107.3);
}

.element {
  color: var(--black-metal);
  background-color: hsl(60 20% 2%);
  border-color: oklch(0.121 0.007 107.3);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #060604;
  --color-black-metal-50: #f5f5f3;
  --color-black-metal-100: #e8e8e5;
  --color-black-metal-200: #d4d4d1;
  --color-black-metal-300: #b7b8b4;
  --color-black-metal-400: #9f9f9a;
  --color-black-metal-500: #868682;
  --color-black-metal-600: #72726e;
  --color-black-metal-700: #5b5b58;
  --color-black-metal-800: #434240;
  --color-black-metal-900: #2e2e2c;
  --color-black-metal-950: #1b1b19;
}

SCSS

$black-metal: #060604;
$black-metal-rgb: 6, 6, 4;
$black-metal-light: mix(#fff, $black-metal, 20%);
$black-metal-dark: mix(#000, $black-metal, 20%);

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