#607331

CSS

:root {
  --muddy-green: #607331;
  --muddy-green-rgb: 96 115 49;
  --muddy-green-oklch: oklch(0.525 0.094 123);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(77 40% 32%);
  border-color: oklch(0.525 0.094 123);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #607331;
  --color-muddy-green-50: #effadd;
  --color-muddy-green-100: #e0eecc;
  --color-muddy-green-200: #cbdcb0;
  --color-muddy-green-300: #acc08b;
  --color-muddy-green-400: #94a868;
  --color-muddy-green-500: #7a9046;
  --color-muddy-green-600: #687a3c;
  --color-muddy-green-700: #536230;
  --color-muddy-green-800: #3d4720;
  --color-muddy-green-900: #2a3115;
  --color-muddy-green-950: #181d07;
}

SCSS

$muddy-green: #607331;
$muddy-green-rgb: 96, 115, 49;
$muddy-green-light: mix(#fff, $muddy-green, 20%);
$muddy-green-dark: mix(#000, $muddy-green, 20%);

.element {
  color: $muddy-green;
  box-shadow: 0 0 0 2px rgba($muddy-green, 0.35);
}