#5D7421

CSS

:root {
  --muddy-green: #5d7421;
  --muddy-green-rgb: 93 116 33;
  --muddy-green-oklch: oklch(0.523 0.111 123.7);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(77 56% 29%);
  border-color: oklch(0.523 0.111 123.7);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5d7421;
  --color-muddy-green-50: #edfbd9;
  --color-muddy-green-100: #dfefc7;
  --color-muddy-green-200: #c9ddaa;
  --color-muddy-green-300: #a9c283;
  --color-muddy-green-400: #91aa5d;
  --color-muddy-green-500: #779236;
  --color-muddy-green-600: #657c2f;
  --color-muddy-green-700: #516326;
  --color-muddy-green-800: #3c4818;
  --color-muddy-green-900: #29320f;
  --color-muddy-green-950: #171e03;
}

SCSS

$muddy-green: #5d7421;
$muddy-green-rgb: 93, 116, 33;
$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);
}