#837815

CSS

:root {
  --olive: #837815;
  --olive-rgb: 131 120 21;
  --olive-oklch: oklch(0.566 0.112 102.5);
}

.element {
  color: var(--olive);
  background-color: hsl(54 72% 30%);
  border-color: oklch(0.566 0.112 102.5);
}

Tailwind CSS v4

@theme {
  --color-olive: #837815;
  --color-olive-50: #faf8d3;
  --color-olive-100: #edebc0;
  --color-olive-200: #dbd7a0;
  --color-olive-300: #c0bb76;
  --color-olive-400: #aba14d;
  --color-olive-500: #958818;
  --color-olive-600: #7e7319;
  --color-olive-700: #655c14;
  --color-olive-800: #4b430b;
  --color-olive-900: #342e07;
  --color-olive-950: #201b00;
}

SCSS

$olive: #837815;
$olive-rgb: 131, 120, 21;
$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);
}