#677C33

CSS

:root {
  --muddy-green: #677c33;
  --muddy-green-rgb: 103 124 51;
  --muddy-green-oklch: oklch(0.553 0.102 123.2);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(77 42% 34%);
  border-color: oklch(0.553 0.102 123.2);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #677c33;
  --color-muddy-green-50: #eefbdb;
  --color-muddy-green-100: #e0eeca;
  --color-muddy-green-200: #caddad;
  --color-muddy-green-300: #abc187;
  --color-muddy-green-400: #93a963;
  --color-muddy-green-500: #79913f;
  --color-muddy-green-600: #677b36;
  --color-muddy-green-700: #52622b;
  --color-muddy-green-800: #3d481c;
  --color-muddy-green-900: #2a3213;
  --color-muddy-green-950: #181e05;
}

SCSS

$muddy-green: #677c33;
$muddy-green-rgb: 103, 124, 51;
$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);
}