#5A752B

CSS

:root {
  --muddy-green: #5a752b;
  --muddy-green-rgb: 90 117 43;
  --muddy-green-oklch: oklch(0.525 0.106 126.7);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(82 46% 31%);
  border-color: oklch(0.525 0.106 126.7);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5a752b;
  --color-muddy-green-50: #ecfcdc;
  --color-muddy-green-100: #ddefca;
  --color-muddy-green-200: #c7deae;
  --color-muddy-green-300: #a7c288;
  --color-muddy-green-400: #8eaa64;
  --color-muddy-green-500: #749340;
  --color-muddy-green-600: #627c37;
  --color-muddy-green-700: #4e632c;
  --color-muddy-green-800: #3a491d;
  --color-muddy-green-900: #283213;
  --color-muddy-green-950: #161e05;
}

SCSS

$muddy-green: #5a752b;
$muddy-green-rgb: 90, 117, 43;
$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);
}