#7F7613

CSS

:root {
  --olive: #7f7613;
  --olive-rgb: 127 118 19;
  --olive-oklch: oklch(0.557 0.111 103.8);
}

.element {
  color: var(--olive);
  background-color: hsl(55 74% 29%);
  border-color: oklch(0.557 0.111 103.8);
}

Tailwind CSS v4

@theme {
  --color-olive: #7f7613;
  --color-olive-50: #f9f8d3;
  --color-olive-100: #ecebc0;
  --color-olive-200: #dad8a0;
  --color-olive-300: #bfbb77;
  --color-olive-400: #aaa24e;
  --color-olive-500: #93891b;
  --color-olive-600: #7c741b;
  --color-olive-700: #635d16;
  --color-olive-800: #4a430c;
  --color-olive-900: #342f07;
  --color-olive-950: #1f1b00;
}

SCSS

$olive: #7f7613;
$olive-rgb: 127, 118, 19;
$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);
}