#647232

CSS

:root {
  --muddy-green: #647232;
  --muddy-green-rgb: 100 114 50;
  --muddy-green-oklch: oklch(0.526 0.09 119.9);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(73 39% 32%);
  border-color: oklch(0.526 0.09 119.9);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #647232;
  --color-muddy-green-50: #f1fadd;
  --color-muddy-green-100: #e3edcc;
  --color-muddy-green-200: #cddbb0;
  --color-muddy-green-300: #afbf8c;
  --color-muddy-green-400: #97a769;
  --color-muddy-green-500: #7f8f47;
  --color-muddy-green-600: #6b793d;
  --color-muddy-green-700: #566130;
  --color-muddy-green-800: #404721;
  --color-muddy-green-900: #2c3116;
  --color-muddy-green-950: #191d07;
}

SCSS

$muddy-green: #647232;
$muddy-green-rgb: 100, 114, 50;
$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);
}