#5A7524

CSS

:root {
  --muddy-green: #5a7524;
  --muddy-green-rgb: 90 117 36;
  --muddy-green-oklch: oklch(0.524 0.112 125.9);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(80 53% 30%);
  border-color: oklch(0.524 0.112 125.9);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5a7524;
  --color-muddy-green-50: #ecfcda;
  --color-muddy-green-100: #ddf0c8;
  --color-muddy-green-200: #c6deab;
  --color-muddy-green-300: #a7c385;
  --color-muddy-green-400: #8eaa5f;
  --color-muddy-green-500: #749339;
  --color-muddy-green-600: #627c32;
  --color-muddy-green-700: #4e6427;
  --color-muddy-green-800: #3a4919;
  --color-muddy-green-900: #283210;
  --color-muddy-green-950: #161e03;
}

SCSS

$muddy-green: #5a7524;
$muddy-green-rgb: 90, 117, 36;
$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);
}