#060E11

CSS

:root {
  --black-knight: #060e11;
  --black-knight-rgb: 6 14 17;
  --black-knight-oklch: oklch(0.157 0.015 221.9);
}

.element {
  color: var(--black-knight);
  background-color: hsl(196 48% 5%);
  border-color: oklch(0.157 0.015 221.9);
}

Tailwind CSS v4

@theme {
  --color-black-knight: #060e11;
  --color-black-knight-50: #f1f6f8;
  --color-black-knight-100: #e3e9eb;
  --color-black-knight-200: #ced6d9;
  --color-black-knight-300: #b0b9bd;
  --color-black-knight-400: #96a1a5;
  --color-black-knight-500: #7c898d;
  --color-black-knight-600: #697477;
  --color-black-knight-700: #545c5f;
  --color-black-knight-800: #3d4446;
  --color-black-knight-900: #2a2f30;
  --color-black-knight-950: #181b1d;
}

SCSS

$black-knight: #060e11;
$black-knight-rgb: 6, 14, 17;
$black-knight-light: mix(#fff, $black-knight, 20%);
$black-knight-dark: mix(#000, $black-knight, 20%);

.element {
  color: $black-knight;
  box-shadow: 0 0 0 2px rgba($black-knight, 0.35);
}