#63732C

CSS

:root {
  --muddy-green: #63732c;
  --muddy-green-rgb: 99 115 44;
  --muddy-green-oklch: oklch(0.527 0.098 120.6);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(74 45% 31%);
  border-color: oklch(0.527 0.098 120.6);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #63732c;
  --color-muddy-green-50: #f0fadc;
  --color-muddy-green-100: #e2eeca;
  --color-muddy-green-200: #ccdcad;
  --color-muddy-green-300: #aec088;
  --color-muddy-green-400: #96a764;
  --color-muddy-green-500: #7d9040;
  --color-muddy-green-600: #6a7a37;
  --color-muddy-green-700: #55612c;
  --color-muddy-green-800: #3f471d;
  --color-muddy-green-900: #2b3113;
  --color-muddy-green-950: #191d05;
}

SCSS

$muddy-green: #63732c;
$muddy-green-rgb: 99, 115, 44;
$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);
}