#030E01

CSS

:root {
  --blackn-t: #030e01;
  --blackn-t-rgb: 3 14 1;
  --blackn-t-oklch: oklch(0.146 0.04 138.4);
}

.element {
  color: var(--blackn-t);
  background-color: hsl(111 87% 3%);
  border-color: oklch(0.146 0.04 138.4);
}

Tailwind CSS v4

@theme {
  --color-blackn-t: #030e01;
  --color-blackn-t-50: #eff8ed;
  --color-blackn-t-100: #e1ebdf;
  --color-blackn-t-200: #ccd9c9;
  --color-blackn-t-300: #adbdaa;
  --color-blackn-t-400: #93a48e;
  --color-blackn-t-500: #798d73;
  --color-blackn-t-600: #677762;
  --color-blackn-t-700: #525f4e;
  --color-blackn-t-800: #3c4638;
  --color-blackn-t-900: #293026;
  --color-blackn-t-950: #171c15;
}

SCSS

$blackn-t: #030e01;
$blackn-t-rgb: 3, 14, 1;
$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);
}