#6A712F

CSS

:root {
  --muddy-green: #6a712f;
  --muddy-green-rgb: 106 113 47;
  --muddy-green-oklch: oklch(0.528 0.09 114.6);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(66 41% 31%);
  border-color: oklch(0.528 0.09 114.6);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #6a712f;
  --color-muddy-green-50: #f3f9dc;
  --color-muddy-green-100: #e5eccb;
  --color-muddy-green-200: #d1daae;
  --color-muddy-green-300: #b4be89;
  --color-muddy-green-400: #9da566;
  --color-muddy-green-500: #858d43;
  --color-muddy-green-600: #70773a;
  --color-muddy-green-700: #5a5f2e;
  --color-muddy-green-800: #43461f;
  --color-muddy-green-900: #2e3014;
  --color-muddy-green-950: #1b1c06;
}

SCSS

$muddy-green: #6a712f;
$muddy-green-rgb: 106, 113, 47;
$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);
}