#687129

CSS

:root {
  --muddy-green: #687129;
  --muddy-green-rgb: 104 113 41;
  --muddy-green-oklch: oklch(0.525 0.096 115.8);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(68 47% 30%);
  border-color: oklch(0.525 0.096 115.8);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #687129;
  --color-muddy-green-50: #f2f9db;
  --color-muddy-green-100: #e5edc9;
  --color-muddy-green-200: #d0daac;
  --color-muddy-green-300: #b3bf86;
  --color-muddy-green-400: #9ba662;
  --color-muddy-green-500: #838e3d;
  --color-muddy-green-600: #6f7835;
  --color-muddy-green-700: #59602a;
  --color-muddy-green-800: #42461c;
  --color-muddy-green-900: #2e3012;
  --color-muddy-green-950: #1a1d05;
}

SCSS

$muddy-green: #687129;
$muddy-green-rgb: 104, 113, 41;
$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);
}