#224028

CSS

:root {
  --queen-of-trees: #224028;
  --queen-of-trees-rgb: 34 64 40;
  --queen-of-trees-oklch: oklch(0.34 0.055 149.2);
}

.element {
  color: var(--queen-of-trees);
  background-color: hsl(132 31% 19%);
  border-color: oklch(0.34 0.055 149.2);
}

Tailwind CSS v4

@theme {
  --color-queen-of-trees: #224028;
  --color-queen-of-trees-50: #eafaed;
  --color-queen-of-trees-100: #dbeedf;
  --color-queen-of-trees-200: #c4dbc8;
  --color-queen-of-trees-300: #a4c0a9;
  --color-queen-of-trees-400: #88a88d;
  --color-queen-of-trees-500: #6d9172;
  --color-queen-of-trees-600: #5c7a61;
  --color-queen-of-trees-700: #49624d;
  --color-queen-of-trees-800: #364837;
  --color-queen-of-trees-900: #253226;
  --color-queen-of-trees-950: #131e14;
}

SCSS

$queen-of-trees: #224028;
$queen-of-trees-rgb: 34, 64, 40;
$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);
}