#4A6814

CSS

:root {
  --over-the-hills: #4a6814;
  --over-the-hills-rgb: 74 104 20;
  --over-the-hills-oklch: oklch(0.477 0.114 127.8);
}

.element {
  color: var(--over-the-hills);
  background-color: hsl(81 68% 24%);
  border-color: oklch(0.477 0.114 127.8);
}

Tailwind CSS v4

@theme {
  --color-over-the-hills: #4a6814;
  --color-over-the-hills-50: #ebfcda;
  --color-over-the-hills-100: #dcf0c8;
  --color-over-the-hills-200: #c4dfab;
  --color-over-the-hills-300: #a4c385;
  --color-over-the-hills-400: #8bab60;
  --color-over-the-hills-500: #70943a;
  --color-over-the-hills-600: #5f7d33;
  --color-over-the-hills-700: #4c6428;
  --color-over-the-hills-800: #39491a;
  --color-over-the-hills-900: #273311;
  --color-over-the-hills-950: #151e04;
}

SCSS

$over-the-hills: #4a6814;
$over-the-hills-rgb: 74, 104, 20;
$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);
}