#6C7D32

CSS

:root {
  --muddy-green: #6c7d32;
  --muddy-green-rgb: 108 125 50;
  --muddy-green-oklch: oklch(0.559 0.102 120.5);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(74 43% 34%);
  border-color: oklch(0.559 0.102 120.5);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #6c7d32;
  --color-muddy-green-50: #f0fada;
  --color-muddy-green-100: #e1eec9;
  --color-muddy-green-200: #ccdcac;
  --color-muddy-green-300: #aec085;
  --color-muddy-green-400: #96a861;
  --color-muddy-green-500: #7d903c;
  --color-muddy-green-600: #6a7a34;
  --color-muddy-green-700: #546229;
  --color-muddy-green-800: #3f471b;
  --color-muddy-green-900: #2b3111;
  --color-muddy-green-950: #191d04;
}

SCSS

$muddy-green: #6c7d32;
$muddy-green-rgb: 108, 125, 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);
}