#060D03

CSS

:root {
  --blackn-t: #060d03;
  --blackn-t-rgb: 6 13 3;
  --blackn-t-oklch: oklch(0.147 0.028 134.4);
}

.element {
  color: var(--blackn-t);
  background-color: hsl(102 63% 3%);
  border-color: oklch(0.147 0.028 134.4);
}

Tailwind CSS v4

@theme {
  --color-blackn-t: #060d03;
  --color-blackn-t-50: #f2f7ef;
  --color-blackn-t-100: #e4eae1;
  --color-blackn-t-200: #cfd7cc;
  --color-blackn-t-300: #b1bbad;
  --color-blackn-t-400: #98a292;
  --color-blackn-t-500: #7f8b78;
  --color-blackn-t-600: #6b7566;
  --color-blackn-t-700: #565e51;
  --color-blackn-t-800: #3f453b;
  --color-blackn-t-900: #2b2f28;
  --color-blackn-t-950: #191c16;
}

SCSS

$blackn-t: #060d03;
$blackn-t-rgb: 6, 13, 3;
$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);
}