#547615

CSS

:root {
  --over-the-hills: #547615;
  --over-the-hills-rgb: 84 118 21;
  --over-the-hills-oklch: oklch(0.521 0.126 127.8);
}

.element {
  color: var(--over-the-hills);
  background-color: hsl(81 70% 27%);
  border-color: oklch(0.521 0.126 127.8);
}

Tailwind CSS v4

@theme {
  --color-over-the-hills: #547615;
  --color-over-the-hills-50: #e9fdd7;
  --color-over-the-hills-100: #daf1c5;
  --color-over-the-hills-200: #c3e0a7;
  --color-over-the-hills-300: #a2c57f;
  --color-over-the-hills-400: #89ac57;
  --color-over-the-hills-500: #6e952d;
  --color-over-the-hills-600: #5d7e28;
  --color-over-the-hills-700: #4a6520;
  --color-over-the-hills-800: #384a13;
  --color-over-the-hills-900: #26330c;
  --color-over-the-hills-950: #141f01;
}

SCSS

$over-the-hills: #547615;
$over-the-hills-rgb: 84, 118, 21;
$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);
}