#497100

CSS

:root {
  --over-the-hills: #497100;
  --over-the-hills-rgb: 73 113 0;
  --over-the-hills-oklch: oklch(0.5 0.134 129.8);
}

.element {
  color: var(--over-the-hills);
  background-color: hsl(81 100% 22%);
  border-color: oklch(0.5 0.134 129.8);
}

Tailwind CSS v4

@theme {
  --color-over-the-hills: #497100;
  --color-over-the-hills-50: #e7fed6;
  --color-over-the-hills-100: #d8f2c4;
  --color-over-the-hills-200: #bfe1a5;
  --color-over-the-hills-300: #9ec67d;
  --color-over-the-hills-400: #84ae54;
  --color-over-the-hills-500: #689727;
  --color-over-the-hills-600: #588024;
  --color-over-the-hills-700: #47661c;
  --color-over-the-hills-800: #354b10;
  --color-over-the-hills-900: #24340a;
  --color-over-the-hills-950: #131f00;
}

SCSS

$over-the-hills: #497100;
$over-the-hills-rgb: 73, 113, 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);
}