#607328

CSS

:root {
  --muddy-green: #607328;
  --muddy-green-rgb: 96 115 40;
  --muddy-green-oklch: oklch(0.524 0.103 122.1);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(75 48% 30%);
  border-color: oklch(0.524 0.103 122.1);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #607328;
  --color-muddy-green-50: #effbdb;
  --color-muddy-green-100: #e0eec9;
  --color-muddy-green-200: #cbdcac;
  --color-muddy-green-300: #acc186;
  --color-muddy-green-400: #94a862;
  --color-muddy-green-500: #7b913d;
  --color-muddy-green-600: #687a35;
  --color-muddy-green-700: #53622a;
  --color-muddy-green-800: #3e471b;
  --color-muddy-green-900: #2a3212;
  --color-muddy-green-950: #181d04;
}

SCSS

$muddy-green: #607328;
$muddy-green-rgb: 96, 115, 40;
$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);
}