#687C3F

CSS

:root {
  --beyond-the-pines: #687c3f;
  --beyond-the-pines-rgb: 104 124 63;
  --beyond-the-pines-oklch: oklch(0.555 0.089 124.2);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(80 33% 37%);
  border-color: oklch(0.555 0.089 124.2);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #687c3f;
  --color-beyond-the-pines-50: #effadf;
  --color-beyond-the-pines-100: #e0eece;
  --color-beyond-the-pines-200: #cadcb3;
  --color-beyond-the-pines-300: #acc08f;
  --color-beyond-the-pines-400: #93a86d;
  --color-beyond-the-pines-500: #7a904b;
  --color-beyond-the-pines-600: #677a41;
  --color-beyond-the-pines-700: #526233;
  --color-beyond-the-pines-800: #3d4723;
  --color-beyond-the-pines-900: #2a3117;
  --color-beyond-the-pines-950: #181d08;
}

SCSS

$beyond-the-pines: #687c3f;
$beyond-the-pines-rgb: 104, 124, 63;
$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);
}