#697C2F

CSS

:root {
  --muddy-green: #697c2f;
  --muddy-green-rgb: 105 124 47;
  --muddy-green-oklch: oklch(0.554 0.105 121.6);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(75 45% 34%);
  border-color: oklch(0.554 0.105 121.6);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #697c2f;
  --color-muddy-green-50: #effbda;
  --color-muddy-green-100: #e1eec8;
  --color-muddy-green-200: #cbdcab;
  --color-muddy-green-300: #acc185;
  --color-muddy-green-400: #94a860;
  --color-muddy-green-500: #7b913a;
  --color-muddy-green-600: #687a33;
  --color-muddy-green-700: #536228;
  --color-muddy-green-800: #3e471a;
  --color-muddy-green-900: #2b3211;
  --color-muddy-green-950: #181d04;
}

SCSS

$muddy-green: #697c2f;
$muddy-green-rgb: 105, 124, 47;
$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);
}