#070606

CSS

:root {
  --black-metal: #070606;
  --black-metal-rgb: 7 6 6;
  --black-metal-oklch: oklch(0.124 0.002 17.5);
}

.element {
  color: var(--black-metal);
  background-color: hsl(0 8% 3%);
  border-color: oklch(0.124 0.002 17.5);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #070606;
  --color-black-metal-50: #f6f5f5;
  --color-black-metal-100: #e8e7e7;
  --color-black-metal-200: #d5d4d4;
  --color-black-metal-300: #b8b7b7;
  --color-black-metal-400: #a09e9e;
  --color-black-metal-500: #888585;
  --color-black-metal-600: #737171;
  --color-black-metal-700: #5c5a5a;
  --color-black-metal-800: #434242;
  --color-black-metal-900: #2e2d2e;
  --color-black-metal-950: #1b1a1a;
}

SCSS

$black-metal: #070606;
$black-metal-rgb: 7, 6, 6;
$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);
}