#57761A

CSS

:root {
  --over-the-hills: #57761a;
  --over-the-hills-rgb: 87 118 26;
  --over-the-hills-oklch: oklch(0.523 0.122 126.9);
}

.element {
  color: var(--over-the-hills);
  background-color: hsl(80 64% 28%);
  border-color: oklch(0.523 0.122 126.9);
}

Tailwind CSS v4

@theme {
  --color-over-the-hills: #57761a;
  --color-over-the-hills-50: #eafdd8;
  --color-over-the-hills-100: #dbf0c6;
  --color-over-the-hills-200: #c4dfa8;
  --color-over-the-hills-300: #a4c480;
  --color-over-the-hills-400: #8bac59;
  --color-over-the-hills-500: #719430;
  --color-over-the-hills-600: #5f7d2a;
  --color-over-the-hills-700: #4c6422;
  --color-over-the-hills-800: #394914;
  --color-over-the-hills-900: #27330d;
  --color-over-the-hills-950: #151e02;
}

SCSS

$over-the-hills: #57761a;
$over-the-hills-rgb: 87, 118, 26;
$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);
}