#7B781D

CSS

:root {
  --olive: #7b781d;
  --olive-rgb: 123 120 29;
  --olive-oklch: oklch(0.558 0.109 107.5);
}

.element {
  color: var(--olive);
  background-color: hsl(58 62% 30%);
  border-color: oklch(0.558 0.109 107.5);
}

Tailwind CSS v4

@theme {
  --color-olive: #7b781d;
  --color-olive-50: #f7f8d5;
  --color-olive-100: #eaecc2;
  --color-olive-200: #d7d9a3;
  --color-olive-300: #bbbd7b;
  --color-olive-400: #a5a353;
  --color-olive-500: #8e8b25;
  --color-olive-600: #787522;
  --color-olive-700: #605e1b;
  --color-olive-800: #484410;
  --color-olive-900: #322f0a;
  --color-olive-950: #1e1c00;
}

SCSS

$olive: #7b781d;
$olive-rgb: 123, 120, 29;
$olive-light: mix(#fff, $olive, 20%);
$olive-dark: mix(#000, $olive, 20%);

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