#070602

CSS

:root {
  --black-metal: #070602;
  --black-metal-rgb: 7 6 2;
  --black-metal-oklch: oklch(0.121 0.015 99.3);
}

.element {
  color: var(--black-metal);
  background-color: hsl(48 56% 2%);
  border-color: oklch(0.121 0.015 99.3);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #070602;
  --color-black-metal-50: #f6f5f1;
  --color-black-metal-100: #e9e8e3;
  --color-black-metal-200: #d5d4cd;
  --color-black-metal-300: #b9b8af;
  --color-black-metal-400: #a09f95;
  --color-black-metal-500: #88867c;
  --color-black-metal-600: #737269;
  --color-black-metal-700: #5c5b54;
  --color-black-metal-800: #44423d;
  --color-black-metal-900: #2f2e2a;
  --color-black-metal-950: #1b1b17;
}

SCSS

$black-metal: #070602;
$black-metal-rgb: 7, 6, 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);
}