#647D39

CSS

:root {
  --beyond-the-pines: #647d39;
  --beyond-the-pines-rgb: 100 125 57;
  --beyond-the-pines-oklch: oklch(0.554 0.099 126.2);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(82 37% 36%);
  border-color: oklch(0.554 0.099 126.2);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #647d39;
  --color-beyond-the-pines-50: #edfbdd;
  --color-beyond-the-pines-100: #deefcc;
  --color-beyond-the-pines-200: #c8ddb0;
  --color-beyond-the-pines-300: #a9c28b;
  --color-beyond-the-pines-400: #90a968;
  --color-beyond-the-pines-500: #769245;
  --color-beyond-the-pines-600: #647b3c;
  --color-beyond-the-pines-700: #4f632f;
  --color-beyond-the-pines-800: #3b4820;
  --color-beyond-the-pines-900: #283215;
  --color-beyond-the-pines-950: #161e06;
}

SCSS

$beyond-the-pines: #647d39;
$beyond-the-pines-rgb: 100, 125, 57;
$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);
}