#5A7F5C

CSS

:root {
  --clouded-pine: #5a7f5c;
  --clouded-pine-rgb: 90 127 92;
  --clouded-pine-oklch: oklch(0.559 0.068 145.9);
}

.element {
  color: var(--clouded-pine);
  background-color: hsl(123 17% 43%);
  border-color: oklch(0.559 0.068 145.9);
}

Tailwind CSS v4

@theme {
  --color-clouded-pine: #5a7f5c;
  --color-clouded-pine-50: #e9fbea;
  --color-clouded-pine-100: #d9efdb;
  --color-clouded-pine-200: #c2ddc4;
  --color-clouded-pine-300: #a1c1a4;
  --color-clouded-pine-400: #85aa87;
  --color-clouded-pine-500: #69936b;
  --color-clouded-pine-600: #597c5b;
  --color-clouded-pine-700: #476348;
  --color-clouded-pine-800: #344933;
  --color-clouded-pine-900: #233223;
  --color-clouded-pine-950: #121e12;
}

SCSS

$clouded-pine: #5a7f5c;
$clouded-pine-rgb: 90, 127, 92;
$clouded-pine-light: mix(#fff, $clouded-pine, 20%);
$clouded-pine-dark: mix(#000, $clouded-pine, 20%);

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