#041005

CSS

:root {
  --blackn-t: #041005;
  --blackn-t-rgb: 4 16 5;
  --blackn-t-oklch: oklch(0.156 0.032 146.3);
}

.element {
  color: var(--blackn-t);
  background-color: hsl(125 60% 4%);
  border-color: oklch(0.156 0.032 146.3);
}

Tailwind CSS v4

@theme {
  --color-blackn-t: #041005;
  --color-blackn-t-50: #eff8f0;
  --color-blackn-t-100: #e1ebe2;
  --color-blackn-t-200: #ccd8cd;
  --color-blackn-t-300: #adbcaf;
  --color-blackn-t-400: #93a494;
  --color-blackn-t-500: #798c7a;
  --color-blackn-t-600: #677767;
  --color-blackn-t-700: #525f53;
  --color-blackn-t-800: #3c453c;
  --color-blackn-t-900: #293029;
  --color-blackn-t-950: #171c17;
}

SCSS

$blackn-t: #041005;
$blackn-t-rgb: 4, 16, 5;
$blackn-t-light: mix(#fff, $blackn-t, 20%);
$blackn-t-dark: mix(#000, $blackn-t, 20%);

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