#060707

CSS

:root {
  --black-metal: #060707;
  --black-metal-rgb: 6 7 7;
  --black-metal-oklch: oklch(0.127 0.002 196.9);
}

.element {
  color: var(--black-metal);
  background-color: hsl(180 8% 3%);
  border-color: oklch(0.127 0.002 196.9);
}

Tailwind CSS v4

@theme {
  --color-black-metal: #060707;
  --color-black-metal-50: #f4f5f5;
  --color-black-metal-100: #e7e8e8;
  --color-black-metal-200: #d3d4d4;
  --color-black-metal-300: #b6b8b8;
  --color-black-metal-400: #9d9f9f;
  --color-black-metal-500: #848787;
  --color-black-metal-600: #707272;
  --color-black-metal-700: #5a5b5b;
  --color-black-metal-800: #414342;
  --color-black-metal-900: #2d2e2e;
  --color-black-metal-950: #1a1b1b;
}

SCSS

$black-metal: #060707;
$black-metal-rgb: 6, 7, 7;
$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);
}