#54726C

CSS

:root {
  --dark-forest: #54726c;
  --dark-forest-rgb: 84 114 108;
  --dark-forest-oklch: oklch(0.527 0.036 181.2);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(168 15% 39%);
  border-color: oklch(0.527 0.036 181.2);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #54726c;
  --color-dark-forest-50: #ebf9f6;
  --color-dark-forest-100: #dcece9;
  --color-dark-forest-200: #c4dad6;
  --color-dark-forest-300: #a4beb9;
  --color-dark-forest-400: #88a6a0;
  --color-dark-forest-500: #6c8e87;
  --color-dark-forest-600: #5c7873;
  --color-dark-forest-700: #49605c;
  --color-dark-forest-800: #354743;
  --color-dark-forest-900: #24312e;
  --color-dark-forest-950: #131d1b;
}

SCSS

$dark-forest: #54726c;
$dark-forest-rgb: 84, 114, 108;
$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);
}