#89A451

CSS

:root {
  --lime-it-or-leave-it: #89a451;
  --lime-it-or-leave-it-rgb: 137 164 81;
  --lime-it-or-leave-it-oklch: oklch(0.679 0.114 124.3);
}

.element {
  color: var(--lime-it-or-leave-it);
  background-color: hsl(80 34% 48%);
  border-color: oklch(0.679 0.114 124.3);
}

Tailwind CSS v4

@theme {
  --color-lime-it-or-leave-it: #89a451;
  --color-lime-it-or-leave-it-50: #edfcd9;
  --color-lime-it-or-leave-it-100: #deefc6;
  --color-lime-it-or-leave-it-200: #c8dea9;
  --color-lime-it-or-leave-it-300: #a8c282;
  --color-lime-it-or-leave-it-400: #90aa5c;
  --color-lime-it-or-leave-it-500: #769334;
  --color-lime-it-or-leave-it-600: #647c2e;
  --color-lime-it-or-leave-it-700: #506324;
  --color-lime-it-or-leave-it-800: #3c4817;
  --color-lime-it-or-leave-it-900: #29320e;
  --color-lime-it-or-leave-it-950: #171e02;
}

SCSS

$lime-it-or-leave-it: #89a451;
$lime-it-or-leave-it-rgb: 137, 164, 81;
$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);
}