#687C35

CSS

:root {
  --muddy-green: #687c35;
  --muddy-green-rgb: 104 124 53;
  --muddy-green-oklch: oklch(0.554 0.1 122.8);
}

.element {
  color: var(--muddy-green);
  background-color: hsl(77 40% 35%);
  border-color: oklch(0.554 0.1 122.8);
}

Tailwind CSS v4

@theme {
  --color-muddy-green: #687c35;
  --color-muddy-green-50: #eefbdc;
  --color-muddy-green-100: #e0eeca;
  --color-muddy-green-200: #cadcae;
  --color-muddy-green-300: #acc188;
  --color-muddy-green-400: #93a865;
  --color-muddy-green-500: #7a9141;
  --color-muddy-green-600: #677a38;
  --color-muddy-green-700: #53622c;
  --color-muddy-green-800: #3d471d;
  --color-muddy-green-900: #2a3213;
  --color-muddy-green-950: #181d05;
}

SCSS

$muddy-green: #687c35;
$muddy-green-rgb: 104, 124, 53;
$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);
}