#81A64B

CSS

:root {
  --lime-it-or-leave-it: #81a64b;
  --lime-it-or-leave-it-rgb: 129 166 75;
  --lime-it-or-leave-it-oklch: oklch(0.678 0.127 127.8);
}

.element {
  color: var(--lime-it-or-leave-it);
  background-color: hsl(84 38% 47%);
  border-color: oklch(0.678 0.127 127.8);
}

Tailwind CSS v4

@theme {
  --color-lime-it-or-leave-it: #81a64b;
  --color-lime-it-or-leave-it-50: #e9fdd7;
  --color-lime-it-or-leave-it-100: #daf1c5;
  --color-lime-it-or-leave-it-200: #c3e0a6;
  --color-lime-it-or-leave-it-300: #a2c57f;
  --color-lime-it-or-leave-it-400: #89ac57;
  --color-lime-it-or-leave-it-500: #6e952c;
  --color-lime-it-or-leave-it-600: #5d7e27;
  --color-lime-it-or-leave-it-700: #4a651f;
  --color-lime-it-or-leave-it-800: #384a12;
  --color-lime-it-or-leave-it-900: #26330b;
  --color-lime-it-or-leave-it-950: #141f01;
}

SCSS

$lime-it-or-leave-it: #81a64b;
$lime-it-or-leave-it-rgb: 129, 166, 75;
$lime-it-or-leave-it-light: mix(#fff, $lime-it-or-leave-it, 20%);
$lime-it-or-leave-it-dark: mix(#000, $lime-it-or-leave-it, 20%);

.element {
  color: $lime-it-or-leave-it;
  box-shadow: 0 0 0 2px rgba($lime-it-or-leave-it, 0.35);
}