#637C46

CSS

:root {
  --beyond-the-pines: #637c46;
  --beyond-the-pines-rgb: 99 124 70;
  --beyond-the-pines-oklch: oklch(0.553 0.083 129.1);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(88 28% 38%);
  border-color: oklch(0.553 0.083 129.1);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #637c46;
  --color-beyond-the-pines-50: #edfbe2;
  --color-beyond-the-pines-100: #deeed1;
  --color-beyond-the-pines-200: #c8dcb7;
  --color-beyond-the-pines-300: #a8c194;
  --color-beyond-the-pines-400: #8fa873;
  --color-beyond-the-pines-500: #759154;
  --color-beyond-the-pines-600: #637b48;
  --color-beyond-the-pines-700: #4f6239;
  --color-beyond-the-pines-800: #3a4827;
  --color-beyond-the-pines-900: #28321a;
  --color-beyond-the-pines-950: #161e0b;
}

SCSS

$beyond-the-pines: #637c46;
$beyond-the-pines-rgb: 99, 124, 70;
$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);
}