#6F7600

CSS

:root {
  --topiary-green: #6f7600;
  --topiary-green-rgb: 111 118 0;
  --topiary-green-oklch: oklch(0.541 0.122 113.8);
}

.element {
  color: var(--topiary-green);
  background-color: hsl(64 100% 23%);
  border-color: oklch(0.541 0.122 113.8);
}

Tailwind CSS v4

@theme {
  --color-topiary-green: #6f7600;
  --color-topiary-green-50: #f3fad3;
  --color-topiary-green-100: #e5eec0;
  --color-topiary-green-200: #d1dba0;
  --color-topiary-green-300: #b4bf76;
  --color-topiary-green-400: #9ea64c;
  --color-topiary-green-500: #868e14;
  --color-topiary-green-600: #717816;
  --color-topiary-green-700: #5b6012;
  --color-topiary-green-800: #444608;
  --color-topiary-green-900: #2f3106;
  --color-topiary-green-950: #1b1d00;
}

SCSS

$topiary-green: #6f7600;
$topiary-green-rgb: 111, 118, 0;
$topiary-green-light: mix(#fff, $topiary-green, 20%);
$topiary-green-dark: mix(#000, $topiary-green, 20%);

.element {
  color: $topiary-green;
  box-shadow: 0 0 0 2px rgba($topiary-green, 0.35);
}