#677220

CSS

:root {
  --muddy-green: #677220;
  --muddy-green-rgb: 103 114 32;
  --muddy-green-oklch: oklch(0.526 0.105 116.8);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(68 56% 29%);
  border-color: oklch(0.526 0.105 116.8);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #677220;
  --color-muddy-green-50: #f2fad8;
  --color-muddy-green-100: #e4edc6;
  --color-muddy-green-200: #cfdba9;
  --color-muddy-green-300: #b1bf82;
  --color-muddy-green-400: #9aa75c;
  --color-muddy-green-500: #828f34;
  --color-muddy-green-600: #6e792e;
  --color-muddy-green-700: #586124;
  --color-muddy-green-800: #414617;
  --color-muddy-green-900: #2d310f;
  --color-muddy-green-950: #1a1d03;
}

SCSS

$muddy-green: #677220;
$muddy-green-rgb: 103, 114, 32;
$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);
}