#137B5A

CSS

:root {
  --greasy-greens: #137b5a;
  --greasy-greens-rgb: 19 123 90;
  --greasy-greens-oklch: oklch(0.519 0.103 165.4);
}

.element {
  color: var(--greasy-greens);
  background-color: hsl(161 73% 28%);
  border-color: oklch(0.519 0.103 165.4);
}

Tailwind CSS v4

@theme {
  --color-greasy-greens: #137b5a;
  --color-greasy-greens-50: #daffef;
  --color-greasy-greens-100: #c8f4e1;
  --color-greasy-greens-200: #aae3cb;
  --color-greasy-greens-300: #82c9ad;
  --color-greasy-greens-400: #5db290;
  --color-greasy-greens-500: #2f9b75;
  --color-greasy-greens-600: #2a8363;
  --color-greasy-greens-700: #22694f;
  --color-greasy-greens-800: #184d38;
  --color-greasy-greens-900: #103626;
  --color-greasy-greens-950: #022115;
}

SCSS

$greasy-greens: #137b5a;
$greasy-greens-rgb: 19, 123, 90;
$greasy-greens-light: mix(#fff, $greasy-greens, 20%);
$greasy-greens-dark: mix(#000, $greasy-greens, 20%);

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