#343900

CSS

:root {
  --dark-olive: #343900;
  --dark-olive-rgb: 52 57 0;
  --dark-olive-oklch: oklch(0.328 0.075 115.1);
}

.element {
  color: var(--dark-olive);
  background-color: hsl(65 100% 11%);
  border-color: oklch(0.328 0.075 115.1);
}

Tailwind CSS v4

@theme {
  --color-dark-olive: #343900;
  --color-dark-olive-50: #f3f8e1;
  --color-dark-olive-100: #e6ecd0;
  --color-dark-olive-200: #d1d9b5;
  --color-dark-olive-300: #b4bd92;
  --color-dark-olive-400: #9da471;
  --color-dark-olive-500: #848c51;
  --color-dark-olive-600: #707745;
  --color-dark-olive-700: #595f37;
  --color-dark-olive-800: #424526;
  --color-dark-olive-900: #2e3019;
  --color-dark-olive-950: #1b1c0a;
}

SCSS

$dark-olive: #343900;
$dark-olive-rgb: 52, 57, 0;
$dark-olive-light: mix(#fff, $dark-olive, 20%);
$dark-olive-dark: mix(#000, $dark-olive, 20%);

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