#617336

CSS

:root {
  --muddy-green: #617336;
  --muddy-green-rgb: 97 115 54;
  --muddy-green-oklch: oklch(0.526 0.089 123);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(78 36% 33%);
  border-color: oklch(0.526 0.089 123);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #617336;
  --color-muddy-green-50: #effadf;
  --color-muddy-green-100: #e1eece;
  --color-muddy-green-200: #cbdbb2;
  --color-muddy-green-300: #adc08e;
  --color-muddy-green-400: #94a76c;
  --color-muddy-green-500: #7b904b;
  --color-muddy-green-600: #687a40;
  --color-muddy-green-700: #536133;
  --color-muddy-green-800: #3e4723;
  --color-muddy-green-900: #2a3117;
  --color-muddy-green-950: #181d08;
}

SCSS

$muddy-green: #617336;
$muddy-green-rgb: 97, 115, 54;
$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);
}