#5F7337

CSS

:root {
  --muddy-green: #5f7337;
  --muddy-green-rgb: 95 115 55;
  --muddy-green-oklch: oklch(0.525 0.088 124.6);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(80 35% 33%);
  border-color: oklch(0.525 0.088 124.6);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5f7337;
  --color-muddy-green-50: #eefadf;
  --color-muddy-green-100: #e0eece;
  --color-muddy-green-200: #cadcb3;
  --color-muddy-green-300: #abc08f;
  --color-muddy-green-400: #93a86d;
  --color-muddy-green-500: #79904c;
  --color-muddy-green-600: #677a41;
  --color-muddy-green-700: #526234;
  --color-muddy-green-800: #3d4723;
  --color-muddy-green-900: #2a3118;
  --color-muddy-green-950: #171d08;
}

SCSS

$muddy-green: #5f7337;
$muddy-green-rgb: 95, 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);
}