#657D39

CSS

:root {
  --beyond-the-pines: #657d39;
  --beyond-the-pines-rgb: 101 125 57;
  --beyond-the-pines-oklch: oklch(0.555 0.099 125.6);
}

.element {
  color: var(--beyond-the-pines);
  background-color: hsl(81 37% 36%);
  border-color: oklch(0.555 0.099 125.6);
}

Tailwind CSS v4

@theme {
  --color-beyond-the-pines: #657d39;
  --color-beyond-the-pines-50: #edfbdd;
  --color-beyond-the-pines-100: #dfefcc;
  --color-beyond-the-pines-200: #c8ddb0;
  --color-beyond-the-pines-300: #a9c18b;
  --color-beyond-the-pines-400: #90a968;
  --color-beyond-the-pines-500: #769245;
  --color-beyond-the-pines-600: #647b3b;
  --color-beyond-the-pines-700: #50632f;
  --color-beyond-the-pines-800: #3c4820;
  --color-beyond-the-pines-900: #293215;
  --color-beyond-the-pines-950: #171e06;
}

SCSS

$beyond-the-pines: #657d39;
$beyond-the-pines-rgb: 101, 125, 57;
$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);
}