#5E7337

CSS

:root {
  --muddy-green: #5e7337;
  --muddy-green-rgb: 94 115 55;
  --muddy-green-oklch: oklch(0.524 0.089 125.3);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(81 35% 33%);
  border-color: oklch(0.524 0.089 125.3);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5e7337;
  --color-muddy-green-50: #eefadf;
  --color-muddy-green-100: #e0eece;
  --color-muddy-green-200: #cadcb3;
  --color-muddy-green-300: #abc08f;
  --color-muddy-green-400: #92a86e;
  --color-muddy-green-500: #78914d;
  --color-muddy-green-600: #667a42;
  --color-muddy-green-700: #516234;
  --color-muddy-green-800: #3c4724;
  --color-muddy-green-900: #293218;
  --color-muddy-green-950: #171d09;
}

SCSS

$muddy-green: #5e7337;
$muddy-green-rgb: 94, 115, 55;
$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);
}