#647D38

CSS

:root {
  --beyond-the-pines: #647d38;
  --beyond-the-pines-rgb: 100 125 56;
  --beyond-the-pines-oklch: oklch(0.554 0.1 126);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(82 38% 35%);
  border-color: oklch(0.554 0.1 126);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #647d38;
  --color-beyond-the-pines-50: #edfbdd;
  --color-beyond-the-pines-100: #deefcc;
  --color-beyond-the-pines-200: #c8ddaf;
  --color-beyond-the-pines-300: #a9c28a;
  --color-beyond-the-pines-400: #90a967;
  --color-beyond-the-pines-500: #769244;
  --color-beyond-the-pines-600: #647b3b;
  --color-beyond-the-pines-700: #50632f;
  --color-beyond-the-pines-800: #3b481f;
  --color-beyond-the-pines-900: #293214;
  --color-beyond-the-pines-950: #161e06;
}

SCSS

$beyond-the-pines: #647d38;
$beyond-the-pines-rgb: 100, 125, 56;
$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);
}