#080703

CSS

:root {
  --black-metal: #080703;
  --black-metal-rgb: 8 7 3;
  --black-metal-oklch: oklch(0.128 0.013 98.6);
}

.element {
  color: var(--black-metal);
  background-color: hsl(48 45% 2%);
  border-color: oklch(0.128 0.013 98.6);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #080703;
  --color-black-metal-50: #f6f5f1;
  --color-black-metal-100: #e9e8e3;
  --color-black-metal-200: #d5d4ce;
  --color-black-metal-300: #b9b8b0;
  --color-black-metal-400: #a09f96;
  --color-black-metal-500: #88867d;
  --color-black-metal-600: #73726a;
  --color-black-metal-700: #5c5b54;
  --color-black-metal-800: #43423d;
  --color-black-metal-900: #2f2e2a;
  --color-black-metal-950: #1b1b18;
}

SCSS

$black-metal: #080703;
$black-metal-rgb: 8, 7, 3;
$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);
}