#687D4F

CSS

:root {
  --beyond-the-pines: #687d4f;
  --beyond-the-pines-rgb: 104 125 79;
  --beyond-the-pines-oklch: oklch(0.561 0.072 128.5);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(87 23% 40%);
  border-color: oklch(0.561 0.072 128.5);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #687d4f;
  --color-beyond-the-pines-50: #eefae5;
  --color-beyond-the-pines-100: #e0edd4;
  --color-beyond-the-pines-200: #cadbbb;
  --color-beyond-the-pines-300: #abbf99;
  --color-beyond-the-pines-400: #92a77a;
  --color-beyond-the-pines-500: #78905c;
  --color-beyond-the-pines-600: #66794e;
  --color-beyond-the-pines-700: #51613e;
  --color-beyond-the-pines-800: #3c472c;
  --color-beyond-the-pines-900: #29311d;
  --color-beyond-the-pines-950: #171d0d;
}

SCSS

$beyond-the-pines: #687d4f;
$beyond-the-pines-rgb: 104, 125, 79;
$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);
}