#58716D

CSS

:root {
  --dark-forest: #58716d;
  --dark-forest-rgb: 88 113 109;
  --dark-forest-oklch: oklch(0.527 0.03 184.4);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(170 12% 39%);
  border-color: oklch(0.527 0.03 184.4);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #58716d;
  --color-dark-forest-50: #ecf8f6;
  --color-dark-forest-100: #ddebe9;
  --color-dark-forest-200: #c7d9d6;
  --color-dark-forest-300: #a7bdba;
  --color-dark-forest-400: #8ca5a0;
  --color-dark-forest-500: #708d88;
  --color-dark-forest-600: #5f7773;
  --color-dark-forest-700: #4c5f5c;
  --color-dark-forest-800: #374643;
  --color-dark-forest-900: #26302e;
  --color-dark-forest-950: #141d1b;
}

SCSS

$dark-forest: #58716d;
$dark-forest-rgb: 88, 113, 109;
$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);
}