#020600

CSS

:root {
  --black-metal: #020600;
  --black-metal-rgb: 2 6 0;
  --black-metal-oklch: oklch(0.11 0.031 132.1);
}

.element {
  color: var(--black-metal);
  background-color: hsl(100 100% 1%);
  border-color: oklch(0.11 0.031 132.1);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #020600;
  --color-black-metal-50: #f2f7ee;
  --color-black-metal-100: #e4eae0;
  --color-black-metal-200: #cfd7ca;
  --color-black-metal-300: #b1bbab;
  --color-black-metal-400: #98a390;
  --color-black-metal-500: #7f8b76;
  --color-black-metal-600: #6b7564;
  --color-black-metal-700: #565e50;
  --color-black-metal-800: #3f453a;
  --color-black-metal-900: #2b2f27;
  --color-black-metal-950: #191c16;
}

SCSS

$black-metal: #020600;
$black-metal-rgb: 2, 6, 0;
$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);
}