#687132

CSS

:root {
  --muddy-green: #687132;
  --muddy-green-rgb: 104 113 50;
  --muddy-green-oklch: oklch(0.526 0.087 116.2);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(69 39% 32%);
  border-color: oklch(0.526 0.087 116.2);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #687132;
  --color-muddy-green-50: #f2f9dd;
  --color-muddy-green-100: #e5eccc;
  --color-muddy-green-200: #d0dab0;
  --color-muddy-green-300: #b3be8b;
  --color-muddy-green-400: #9ba569;
  --color-muddy-green-500: #838d46;
  --color-muddy-green-600: #6f783d;
  --color-muddy-green-700: #596030;
  --color-muddy-green-800: #424621;
  --color-muddy-green-900: #2d3016;
  --color-muddy-green-950: #1a1c07;
}

SCSS

$muddy-green: #687132;
$muddy-green-rgb: 104, 113, 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);
}