#6A7E2F

CSS

:root {
  --muddy-green: #6a7e2f;
  --muddy-green-rgb: 106 126 47;
  --muddy-green-oklch: oklch(0.56 0.107 121.9);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(75 46% 34%);
  border-color: oklch(0.56 0.107 121.9);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #6a7e2f;
  --color-muddy-green-50: #eefbda;
  --color-muddy-green-100: #e0efc8;
  --color-muddy-green-200: #caddaa;
  --color-muddy-green-300: #acc184;
  --color-muddy-green-400: #94a95e;
  --color-muddy-green-500: #7a9138;
  --color-muddy-green-600: #687b31;
  --color-muddy-green-700: #536227;
  --color-muddy-green-800: #3e4819;
  --color-muddy-green-900: #2a3210;
  --color-muddy-green-950: #181d03;
}

SCSS

$muddy-green: #6a7e2f;
$muddy-green-rgb: 106, 126, 47;
$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);
}