#050503

CSS

:root {
  --black-metal: #050503;
  --black-metal-rgb: 5 5 3;
  --black-metal-oklch: oklch(0.113 0.008 107.6);
}

.element {
  color: var(--black-metal);
  background-color: hsl(60 25% 2%);
  border-color: oklch(0.113 0.008 107.6);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #050503;
  --color-black-metal-50: #f5f5f3;
  --color-black-metal-100: #e8e8e5;
  --color-black-metal-200: #d4d4d1;
  --color-black-metal-300: #b7b8b3;
  --color-black-metal-400: #9f9f9a;
  --color-black-metal-500: #868781;
  --color-black-metal-600: #72726d;
  --color-black-metal-700: #5b5b57;
  --color-black-metal-800: #434240;
  --color-black-metal-900: #2e2e2c;
  --color-black-metal-950: #1b1b19;
}

SCSS

$black-metal: #050503;
$black-metal-rgb: 5, 5, 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);
}