#5F706B

CSS

:root {
  --dark-forest: #5f706b;
  --dark-forest-rgb: 95 112 107;
  --dark-forest-oklch: oklch(0.53 0.022 175.8);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(162 8% 41%);
  border-color: oklch(0.53 0.022 175.8);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #5f706b;
  --color-dark-forest-50: #eff7f5;
  --color-dark-forest-100: #e1eae8;
  --color-dark-forest-200: #cbd7d4;
  --color-dark-forest-300: #acbbb7;
  --color-dark-forest-400: #92a39e;
  --color-dark-forest-500: #788b85;
  --color-dark-forest-600: #657671;
  --color-dark-forest-700: #515e5a;
  --color-dark-forest-800: #3b4542;
  --color-dark-forest-900: #28302d;
  --color-dark-forest-950: #161c1a;
}

SCSS

$dark-forest: #5f706b;
$dark-forest-rgb: 95, 112, 107;
$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);
}