#5A7513

CSS

:root {
  --over-the-hills: #5a7513;
  --over-the-hills-rgb: 90 117 19;
  --over-the-hills-oklch: oklch(0.523 0.123 124.7);
}

.element {
  color: var(--over-the-hills);
  background-color: hsl(77 72% 27%);
  border-color: oklch(0.523 0.123 124.7);
}

Tailwind CSS v4

@theme {
  --color-over-the-hills: #5a7513;
  --color-over-the-hills-50: #ecfcd7;
  --color-over-the-hills-100: #ddf0c4;
  --color-over-the-hills-200: #c6dea6;
  --color-over-the-hills-300: #a7c37e;
  --color-over-the-hills-400: #8eab56;
  --color-over-the-hills-500: #74932a;
  --color-over-the-hills-600: #627d26;
  --color-over-the-hills-700: #4f641e;
  --color-over-the-hills-800: #3b4912;
  --color-over-the-hills-900: #28330b;
  --color-over-the-hills-950: #161e01;
}

SCSS

$over-the-hills: #5a7513;
$over-the-hills-rgb: 90, 117, 19;
$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);
}