#697125

CSS

:root {
  --muddy-green: #697125;
  --muddy-green-rgb: 105 113 37;
  --muddy-green-oklch: oklch(0.526 0.099 115);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(66 51% 29%);
  border-color: oklch(0.526 0.099 115);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #697125;
  --color-muddy-green-50: #f3f9da;
  --color-muddy-green-100: #e5edc8;
  --color-muddy-green-200: #d1daaa;
  --color-muddy-green-300: #b3be84;
  --color-muddy-green-400: #9ca65f;
  --color-muddy-green-500: #848e39;
  --color-muddy-green-600: #707832;
  --color-muddy-green-700: #596027;
  --color-muddy-green-800: #43461a;
  --color-muddy-green-900: #2e3011;
  --color-muddy-green-950: #1b1c04;
}

SCSS

$muddy-green: #697125;
$muddy-green-rgb: 105, 113, 37;
$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);
}