#5E742B

CSS

:root {
  --muddy-green: #5e742b;
  --muddy-green-rgb: 94 116 43;
  --muddy-green-oklch: oklch(0.525 0.102 124);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(78 46% 31%);
  border-color: oklch(0.525 0.102 124);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5e742b;
  --color-muddy-green-50: #eefbdc;
  --color-muddy-green-100: #dfefca;
  --color-muddy-green-200: #c9ddad;
  --color-muddy-green-300: #aac188;
  --color-muddy-green-400: #92a964;
  --color-muddy-green-500: #789140;
  --color-muddy-green-600: #667b37;
  --color-muddy-green-700: #51622c;
  --color-muddy-green-800: #3c481d;
  --color-muddy-green-900: #293213;
  --color-muddy-green-950: #171e05;
}

SCSS

$muddy-green: #5e742b;
$muddy-green-rgb: 94, 116, 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);
}