#070702

CSS

:root {
  --black-metal: #070702;
  --black-metal-rgb: 7 7 2;
  --black-metal-oklch: oklch(0.126 0.017 108.6);
}

.element {
  color: var(--black-metal);
  background-color: hsl(60 56% 2%);
  border-color: oklch(0.126 0.017 108.6);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #070702;
  --color-black-metal-50: #f5f6f0;
  --color-black-metal-100: #e8e8e2;
  --color-black-metal-200: #d4d5cd;
  --color-black-metal-300: #b7b8af;
  --color-black-metal-400: #9f9f94;
  --color-black-metal-500: #87877a;
  --color-black-metal-600: #727268;
  --color-black-metal-700: #5b5c53;
  --color-black-metal-800: #43433c;
  --color-black-metal-900: #2e2e29;
  --color-black-metal-950: #1b1b17;
}

SCSS

$black-metal: #070702;
$black-metal-rgb: 7, 7, 2;
$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);
}