#5C751D

CSS

:root {
  --muddy-green: #5c751d;
  --muddy-green-rgb: 92 117 29;
  --muddy-green-oklch: oklch(0.525 0.116 124.3);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(77 60% 29%);
  border-color: oklch(0.525 0.116 124.3);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #5c751d;
  --color-muddy-green-50: #edfcd8;
  --color-muddy-green-100: #def0c6;
  --color-muddy-green-200: #c7dea8;
  --color-muddy-green-300: #a8c381;
  --color-muddy-green-400: #90aa5b;
  --color-muddy-green-500: #769332;
  --color-muddy-green-600: #647c2c;
  --color-muddy-green-700: #506323;
  --color-muddy-green-800: #3b4816;
  --color-muddy-green-900: #29320e;
  --color-muddy-green-950: #171e02;
}

SCSS

$muddy-green: #5c751d;
$muddy-green-rgb: 92, 117, 29;
$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);
}