#54726B

CSS

:root {
  --dark-forest: #54726b;
  --dark-forest-rgb: 84 114 107;
  --dark-forest-oklch: oklch(0.526 0.036 178.8);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(166 15% 39%);
  border-color: oklch(0.526 0.036 178.8);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #54726b;
  --color-dark-forest-50: #ebf9f6;
  --color-dark-forest-100: #dcece8;
  --color-dark-forest-200: #c4dad5;
  --color-dark-forest-300: #a4beb8;
  --color-dark-forest-400: #88a69f;
  --color-dark-forest-500: #6c8e86;
  --color-dark-forest-600: #5c7972;
  --color-dark-forest-700: #49605b;
  --color-dark-forest-800: #354742;
  --color-dark-forest-900: #24312e;
  --color-dark-forest-950: #131d1a;
}

SCSS

$dark-forest: #54726b;
$dark-forest-rgb: 84, 114, 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);
}