#455631

CSS

:root {
  --zen-garden-olive: #455631;
  --zen-garden-olive-rgb: 69 86 49;
  --zen-garden-olive-oklch: oklch(0.429 0.061 128.8);
}

.element {
  color: var(--zen-garden-olive);
  background-color: hsl(88 27% 26%);
  border-color: oklch(0.429 0.061 128.8);
}

Tailwind CSS v4

@theme {
  --color-zen-garden-olive: #455631;
  --color-zen-garden-olive-50: #eff9e7;
  --color-zen-garden-olive-100: #e1ecd7;
  --color-zen-garden-olive-200: #cbdabf;
  --color-zen-garden-olive-300: #adbe9e;
  --color-zen-garden-olive-400: #93a680;
  --color-zen-garden-olive-500: #7a8e63;
  --color-zen-garden-olive-600: #677854;
  --color-zen-garden-olive-700: #526043;
  --color-zen-garden-olive-800: #3d462f;
  --color-zen-garden-olive-900: #2a3120;
  --color-zen-garden-olive-950: #171d10;
}

SCSS

$zen-garden-olive: #455631;
$zen-garden-olive-rgb: 69, 86, 49;
$zen-garden-olive-light: mix(#fff, $zen-garden-olive, 20%);
$zen-garden-olive-dark: mix(#000, $zen-garden-olive, 20%);

.element {
  color: $zen-garden-olive;
  box-shadow: 0 0 0 2px rgba($zen-garden-olive, 0.35);
}