#657F36

CSS

:root {
  --beyond-the-pines: #657f36;
  --beyond-the-pines-rgb: 101 127 54;
  --beyond-the-pines-oklch: oklch(0.559 0.105 125.9);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(81 40% 35%);
  border-color: oklch(0.559 0.105 125.9);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #657f36;
  --color-beyond-the-pines-50: #ecfbdc;
  --color-beyond-the-pines-100: #deefca;
  --color-beyond-the-pines-200: #c7ddae;
  --color-beyond-the-pines-300: #a8c288;
  --color-beyond-the-pines-400: #8faa64;
  --color-beyond-the-pines-500: #759240;
  --color-beyond-the-pines-600: #637c37;
  --color-beyond-the-pines-700: #4f632c;
  --color-beyond-the-pines-800: #3b481d;
  --color-beyond-the-pines-900: #283213;
  --color-beyond-the-pines-950: #161e05;
}

SCSS

$beyond-the-pines: #657f36;
$beyond-the-pines-rgb: 101, 127, 54;
$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);
}