#416400

CSS

:root {
  --over-the-hills: #416400;
  --over-the-hills-rgb: 65 100 0;
  --over-the-hills-oklch: oklch(0.459 0.122 129.4);
}

.element {
  color: var(--over-the-hills);
  background-color: hsl(81 100% 20%);
  border-color: oklch(0.459 0.122 129.4);
}

Tailwind CSS v4

@theme {
  --color-over-the-hills: #416400;
  --color-over-the-hills-50: #e9fdd9;
  --color-over-the-hills-100: #d9f1c7;
  --color-over-the-hills-200: #c2e0a9;
  --color-over-the-hills-300: #a1c582;
  --color-over-the-hills-400: #87ad5c;
  --color-over-the-hills-500: #6c9534;
  --color-over-the-hills-600: #5b7e2e;
  --color-over-the-hills-700: #496524;
  --color-over-the-hills-800: #364a16;
  --color-over-the-hills-900: #25330e;
  --color-over-the-hills-950: #141f02;
}

SCSS

$over-the-hills: #416400;
$over-the-hills-rgb: 65, 100, 0;
$over-the-hills-light: mix(#fff, $over-the-hills, 20%);
$over-the-hills-dark: mix(#000, $over-the-hills, 20%);

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