#637F48

CSS

:root {
  --beyond-the-pines: #637f48;
  --beyond-the-pines-rgb: 99 127 72;
  --beyond-the-pines-oklch: oklch(0.561 0.086 130.7);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(91 28% 39%);
  border-color: oklch(0.561 0.086 130.7);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #637f48;
  --color-beyond-the-pines-50: #ecfbe2;
  --color-beyond-the-pines-100: #ddefd1;
  --color-beyond-the-pines-200: #c6ddb7;
  --color-beyond-the-pines-300: #a7c194;
  --color-beyond-the-pines-400: #8da973;
  --color-beyond-the-pines-500: #729254;
  --color-beyond-the-pines-600: #617b48;
  --color-beyond-the-pines-700: #4d6339;
  --color-beyond-the-pines-800: #394827;
  --color-beyond-the-pines-900: #27321a;
  --color-beyond-the-pines-950: #151e0b;
}

SCSS

$beyond-the-pines: #637f48;
$beyond-the-pines-rgb: 99, 127, 72;
$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);
}