#616F68

CSS

:root {
  --dark-forest: #616f68;
  --dark-forest-rgb: 97 111 104;
  --dark-forest-oklch: oklch(0.528 0.02 164.1);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(150 7% 41%);
  border-color: oklch(0.528 0.02 164.1);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #616f68;
  --color-dark-forest-50: #f0f7f4;
  --color-dark-forest-100: #e2eae6;
  --color-dark-forest-200: #cdd7d2;
  --color-dark-forest-300: #aebbb5;
  --color-dark-forest-400: #94a29b;
  --color-dark-forest-500: #7b8b83;
  --color-dark-forest-600: #68756f;
  --color-dark-forest-700: #535e58;
  --color-dark-forest-800: #3c4540;
  --color-dark-forest-900: #2a2f2c;
  --color-dark-forest-950: #171c19;
}

SCSS

$dark-forest: #616f68;
$dark-forest-rgb: 97, 111, 104;
$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);
}