#637230

CSS

:root {
  --muddy-green: #637230;
  --muddy-green-rgb: 99 114 48;
  --muddy-green-oklch: oklch(0.524 0.093 120.4);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(74 41% 32%);
  border-color: oklch(0.524 0.093 120.4);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #637230;
  --color-muddy-green-50: #f0fadd;
  --color-muddy-green-100: #e2edcc;
  --color-muddy-green-200: #cddbb0;
  --color-muddy-green-300: #afc08b;
  --color-muddy-green-400: #97a768;
  --color-muddy-green-500: #7e8f45;
  --color-muddy-green-600: #6b793b;
  --color-muddy-green-700: #55612f;
  --color-muddy-green-800: #3f4720;
  --color-muddy-green-900: #2c3115;
  --color-muddy-green-950: #191d06;
}

SCSS

$muddy-green: #637230;
$muddy-green-rgb: 99, 114, 48;
$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);
}