#7E7621

CSS

:root {
  --olive: #7e7621;
  --olive-rgb: 126 118 33;
  --olive-oklch: oklch(0.557 0.104 103.9);
}

.element {
  color: var(--olive);
  background-color: hsl(55 58% 31%);
  border-color: oklch(0.557 0.104 103.9);
}

Tailwind CSS v4

@theme {
  --color-olive: #7e7621;
  --color-olive-50: #f9f8d6;
  --color-olive-100: #ecebc3;
  --color-olive-200: #dad8a4;
  --color-olive-300: #bebb7c;
  --color-olive-400: #a9a155;
  --color-olive-500: #92892a;
  --color-olive-600: #7b7426;
  --color-olive-700: #635d1e;
  --color-olive-800: #4a4313;
  --color-olive-900: #332f0c;
  --color-olive-950: #1f1b01;
}

SCSS

$olive: #7e7621;
$olive-rgb: 126, 118, 33;
$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);
}