#020502

CSS

:root {
  --black-metal: #020502;
  --black-metal-rgb: 2 5 2;
  --black-metal-oklch: oklch(0.106 0.016 144.3);
}

.element {
  color: var(--black-metal);
  background-color: hsl(120 43% 1%);
  border-color: oklch(0.106 0.016 144.3);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #020502;
  --color-black-metal-50: #f2f6f2;
  --color-black-metal-100: #e4e9e5;
  --color-black-metal-200: #d0d6d0;
  --color-black-metal-300: #b2bab3;
  --color-black-metal-400: #99a199;
  --color-black-metal-500: #808980;
  --color-black-metal-600: #6c746c;
  --color-black-metal-700: #575d56;
  --color-black-metal-800: #3f443f;
  --color-black-metal-900: #2c2f2b;
  --color-black-metal-950: #191b18;
}

SCSS

$black-metal: #020502;
$black-metal-rgb: 2, 5, 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);
}