#1B3E1A

CSS

:root {
  --queen-of-trees: #1b3e1a;
  --queen-of-trees-rgb: 27 62 26;
  --queen-of-trees-oklch: oklch(0.327 0.073 143.2);
}

.element {
  color: var(--queen-of-trees);
  background-color: hsl(118 41% 17%);
  border-color: oklch(0.327 0.073 143.2);
}

Tailwind CSS v4

@theme {
  --color-queen-of-trees: #1b3e1a;
  --color-queen-of-trees-50: #e9fbe9;
  --color-queen-of-trees-100: #d9efd9;
  --color-queen-of-trees-200: #c2ddc2;
  --color-queen-of-trees-300: #a1c2a1;
  --color-queen-of-trees-400: #85aa83;
  --color-queen-of-trees-500: #699366;
  --color-queen-of-trees-600: #597c57;
  --color-queen-of-trees-700: #476345;
  --color-queen-of-trees-800: #344931;
  --color-queen-of-trees-900: #243221;
  --color-queen-of-trees-950: #121e10;
}

SCSS

$queen-of-trees: #1b3e1a;
$queen-of-trees-rgb: 27, 62, 26;
$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);
}