#537269

CSS

:root {
  --dark-forest: #537269;
  --dark-forest-rgb: 83 114 105;
  --dark-forest-oklch: oklch(0.525 0.039 174.9);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(163 16% 39%);
  border-color: oklch(0.525 0.039 174.9);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #537269;
  --color-dark-forest-50: #eaf9f5;
  --color-dark-forest-100: #dbece7;
  --color-dark-forest-200: #c4dad4;
  --color-dark-forest-300: #a4beb7;
  --color-dark-forest-400: #87a69d;
  --color-dark-forest-500: #6c8f85;
  --color-dark-forest-600: #5b7970;
  --color-dark-forest-700: #49615a;
  --color-dark-forest-800: #354741;
  --color-dark-forest-900: #24312d;
  --color-dark-forest-950: #131d1a;
}

SCSS

$dark-forest: #537269;
$dark-forest-rgb: 83, 114, 105;
$dark-forest-light: mix(#fff, $dark-forest, 20%);
$dark-forest-dark: mix(#000, $dark-forest, 20%);

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