#5F7068

CSS

:root {
  --dark-forest: #5f7068;
  --dark-forest-rgb: 95 112 104;
  --dark-forest-oklch: oklch(0.529 0.024 165.4);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(152 8% 41%);
  border-color: oklch(0.529 0.024 165.4);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #5f7068;
  --color-dark-forest-50: #eff7f4;
  --color-dark-forest-100: #e1ebe6;
  --color-dark-forest-200: #cbd8d2;
  --color-dark-forest-300: #acbbb5;
  --color-dark-forest-400: #92a39b;
  --color-dark-forest-500: #788b82;
  --color-dark-forest-600: #66766e;
  --color-dark-forest-700: #515e58;
  --color-dark-forest-800: #3b4540;
  --color-dark-forest-900: #29302c;
  --color-dark-forest-950: #161c19;
}

SCSS

$dark-forest: #5f7068;
$dark-forest-rgb: 95, 112, 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);
}