#5B742A

CSS

:root {
  --muddy-green: #5b742a;
  --muddy-green-rgb: 91 116 42;
  --muddy-green-oklch: oklch(0.523 0.105 125.6);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(80 47% 31%);
  border-color: oklch(0.523 0.105 125.6);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5b742a;
  --color-muddy-green-50: #edfbdc;
  --color-muddy-green-100: #deefca;
  --color-muddy-green-200: #c8ddad;
  --color-muddy-green-300: #a8c288;
  --color-muddy-green-400: #8faa64;
  --color-muddy-green-500: #75923f;
  --color-muddy-green-600: #637c37;
  --color-muddy-green-700: #4f632b;
  --color-muddy-green-800: #3b481d;
  --color-muddy-green-900: #283213;
  --color-muddy-green-950: #161e05;
}

SCSS

$muddy-green: #5b742a;
$muddy-green-rgb: 91, 116, 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);
}