#5E7067

CSS

:root {
  --dark-forest: #5e7067;
  --dark-forest-rgb: 94 112 103;
  --dark-forest-oklch: oklch(0.528 0.026 163.8);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(150 9% 40%);
  border-color: oklch(0.528 0.026 163.8);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #5e7067;
  --color-dark-forest-50: #eff8f3;
  --color-dark-forest-100: #e0ebe6;
  --color-dark-forest-200: #cbd8d2;
  --color-dark-forest-300: #acbcb4;
  --color-dark-forest-400: #91a39a;
  --color-dark-forest-500: #778c82;
  --color-dark-forest-600: #65766e;
  --color-dark-forest-700: #515f58;
  --color-dark-forest-800: #3b4540;
  --color-dark-forest-900: #28302c;
  --color-dark-forest-950: #161c19;
}

SCSS

$dark-forest: #5e7067;
$dark-forest-rgb: 94, 112, 103;
$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);
}