Emerald Ring

CSS

:root {
  --emerald-ring: #578758;
  --emerald-ring-rgb: 87 135 88;
  --emerald-ring-oklch: oklch(0.576 0.088 144.8);
}

.element {
  color: var(--emerald-ring);
  background-color: hsl(121 22% 44%);
  border-color: oklch(0.576 0.088 144.8);
}

Tailwind CSS v4

@theme {
  --color-emerald-ring: #578758;
  --color-emerald-ring-50: #e6fde7;
  --color-emerald-ring-100: #d6f0d7;
  --color-emerald-ring-200: #bcdfbf;
  --color-emerald-ring-300: #9ac49d;
  --color-emerald-ring-400: #7ead7e;
  --color-emerald-ring-500: #609661;
  --color-emerald-ring-600: #517f52;
  --color-emerald-ring-700: #416542;
  --color-emerald-ring-800: #304a2e;
  --color-emerald-ring-900: #20341f;
  --color-emerald-ring-950: #101f0f;
}

SCSS

$emerald-ring: #578758;
$emerald-ring-rgb: 87, 135, 88;
$emerald-ring-light: mix(#fff, $emerald-ring, 20%);
$emerald-ring-dark: mix(#000, $emerald-ring, 20%);

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