#224323

CSS

:root {
  --queen-of-trees: #224323;
  --queen-of-trees-rgb: 34 67 35;
  --queen-of-trees-oklch: oklch(0.348 0.067 144.6);
}

.element {
  color: var(--queen-of-trees);
  background-color: hsl(122 33% 20%);
  border-color: oklch(0.348 0.067 144.6);
}

Tailwind CSS v4

@theme {
  --color-queen-of-trees: #224323;
  --color-queen-of-trees-50: #e9fbea;
  --color-queen-of-trees-100: #daeedb;
  --color-queen-of-trees-200: #c3dcc4;
  --color-queen-of-trees-300: #a2c1a4;
  --color-queen-of-trees-400: #86a986;
  --color-queen-of-trees-500: #6a926a;
  --color-queen-of-trees-600: #5a7c5a;
  --color-queen-of-trees-700: #486348;
  --color-queen-of-trees-800: #354833;
  --color-queen-of-trees-900: #243223;
  --color-queen-of-trees-950: #131e12;
}

SCSS

$queen-of-trees: #224323;
$queen-of-trees-rgb: 34, 67, 35;
$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);
}