#637D40

CSS

:root {
  --beyond-the-pines: #637d40;
  --beyond-the-pines-rgb: 99 125 64;
  --beyond-the-pines-oklch: oklch(0.554 0.092 128.1);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(86 32% 37%);
  border-color: oklch(0.554 0.092 128.1);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #637d40;
  --color-beyond-the-pines-50: #ecfbe0;
  --color-beyond-the-pines-100: #deefcf;
  --color-beyond-the-pines-200: #c7ddb4;
  --color-beyond-the-pines-300: #a8c190;
  --color-beyond-the-pines-400: #8fa96e;
  --color-beyond-the-pines-500: #74924d;
  --color-beyond-the-pines-600: #637b42;
  --color-beyond-the-pines-700: #4f6334;
  --color-beyond-the-pines-800: #3a4824;
  --color-beyond-the-pines-900: #283218;
  --color-beyond-the-pines-950: #161e09;
}

SCSS

$beyond-the-pines: #637d40;
$beyond-the-pines-rgb: 99, 125, 64;
$beyond-the-pines-light: mix(#fff, $beyond-the-pines, 20%);
$beyond-the-pines-dark: mix(#000, $beyond-the-pines, 20%);

.element {
  color: $beyond-the-pines;
  box-shadow: 0 0 0 2px rgba($beyond-the-pines, 0.35);
}