#5A7526

CSS

:root {
  --muddy-green: #5a7526;
  --muddy-green-rgb: 90 117 38;
  --muddy-green-oklch: oklch(0.524 0.11 126.1);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(81 51% 30%);
  border-color: oklch(0.524 0.11 126.1);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5a7526;
  --color-muddy-green-50: #ecfcda;
  --color-muddy-green-100: #ddf0c9;
  --color-muddy-green-200: #c6deac;
  --color-muddy-green-300: #a7c385;
  --color-muddy-green-400: #8eaa60;
  --color-muddy-green-500: #74933b;
  --color-muddy-green-600: #627c33;
  --color-muddy-green-700: #4e6429;
  --color-muddy-green-800: #3a491a;
  --color-muddy-green-900: #283211;
  --color-muddy-green-950: #161e04;
}

SCSS

$muddy-green: #5a7526;
$muddy-green-rgb: 90, 117, 38;
$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);
}