#223822

CSS

:root {
  --queen-of-trees: #223822;
  --queen-of-trees-rgb: 34 56 34;
  --queen-of-trees-oklch: oklch(0.315 0.048 144.3);
}

.element {
  color: var(--queen-of-trees);
  background-color: hsl(120 24% 18%);
  border-color: oklch(0.315 0.048 144.3);
}

Tailwind CSS v4

@theme {
  --color-queen-of-trees: #223822;
  --color-queen-of-trees-50: #edf9ed;
  --color-queen-of-trees-100: #deecdf;
  --color-queen-of-trees-200: #c8dac8;
  --color-queen-of-trees-300: #a8bea9;
  --color-queen-of-trees-400: #8ea68d;
  --color-queen-of-trees-500: #738f73;
  --color-queen-of-trees-600: #627961;
  --color-queen-of-trees-700: #4e614e;
  --color-queen-of-trees-800: #394738;
  --color-queen-of-trees-900: #273126;
  --color-queen-of-trees-950: #151d14;
}

SCSS

$queen-of-trees: #223822;
$queen-of-trees-rgb: 34, 56, 34;
$queen-of-trees-light: mix(#fff, $queen-of-trees, 20%);
$queen-of-trees-dark: mix(#000, $queen-of-trees, 20%);

.element {
  color: $queen-of-trees;
  box-shadow: 0 0 0 2px rgba($queen-of-trees, 0.35);
}