#817606

CSS

:root {
  --olive: #817606;
  --olive-rgb: 129 118 6;
  --olive-oklch: oklch(0.558 0.116 102.9);
}

.element {
  color: var(--olive);
  background-color: hsl(55 91% 26%);
  border-color: oklch(0.558 0.116 102.9);
}

Tailwind CSS v4

@theme {
  --color-olive: #817606;
  --color-olive-50: #faf8d2;
  --color-olive-100: #edebbe;
  --color-olive-200: #dbd89e;
  --color-olive-300: #c0bb74;
  --color-olive-400: #aba14a;
  --color-olive-500: #95880d;
  --color-olive-600: #7e7412;
  --color-olive-700: #655c0f;
  --color-olive-800: #4b4307;
  --color-olive-900: #342e05;
  --color-olive-950: #201b00;
}

SCSS

$olive: #817606;
$olive-rgb: 129, 118, 6;
$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);
}