#56726C

CSS

:root {
  --dark-forest: #56726c;
  --dark-forest-rgb: 86 114 108;
  --dark-forest-oklch: oklch(0.528 0.034 180.3);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(167 14% 39%);
  border-color: oklch(0.528 0.034 180.3);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #56726c;
  --color-dark-forest-50: #ebf9f6;
  --color-dark-forest-100: #dcece9;
  --color-dark-forest-200: #c5d9d5;
  --color-dark-forest-300: #a5bdb9;
  --color-dark-forest-400: #89a59f;
  --color-dark-forest-500: #6e8e87;
  --color-dark-forest-600: #5d7872;
  --color-dark-forest-700: #4a605b;
  --color-dark-forest-800: #364642;
  --color-dark-forest-900: #25312e;
  --color-dark-forest-950: #131d1b;
}

SCSS

$dark-forest: #56726c;
$dark-forest-rgb: 86, 114, 108;
$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);
}