#66722A

CSS

:root {
  --muddy-green: #66722a;
  --muddy-green-rgb: 102 114 42;
  --muddy-green-oklch: oklch(0.526 0.097 117.9);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(70 46% 31%);
  border-color: oklch(0.526 0.097 117.9);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #66722a;
  --color-muddy-green-50: #f1fadb;
  --color-muddy-green-100: #e3edc9;
  --color-muddy-green-200: #cfdbad;
  --color-muddy-green-300: #b1bf87;
  --color-muddy-green-400: #99a663;
  --color-muddy-green-500: #818f3e;
  --color-muddy-green-600: #6d7936;
  --color-muddy-green-700: #57612b;
  --color-muddy-green-800: #41461c;
  --color-muddy-green-900: #2d3112;
  --color-muddy-green-950: #1a1d05;
}

SCSS

$muddy-green: #66722a;
$muddy-green-rgb: 102, 114, 42;
$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);
}