#55726D

CSS

:root {
  --dark-forest: #55726d;
  --dark-forest-rgb: 85 114 109;
  --dark-forest-oklch: oklch(0.528 0.035 183.2);
}

.element {
  color: var(--dark-forest);
  background-color: hsl(170 15% 39%);
  border-color: oklch(0.528 0.035 183.2);
}

Tailwind CSS v4

@theme {
  --color-dark-forest: #55726d;
  --color-dark-forest-50: #ebf9f6;
  --color-dark-forest-100: #dcece9;
  --color-dark-forest-200: #c5d9d6;
  --color-dark-forest-300: #a5bdba;
  --color-dark-forest-400: #89a5a0;
  --color-dark-forest-500: #6d8e88;
  --color-dark-forest-600: #5d7873;
  --color-dark-forest-700: #4a605c;
  --color-dark-forest-800: #354643;
  --color-dark-forest-900: #24312e;
  --color-dark-forest-950: #131d1b;
}

SCSS

$dark-forest: #55726d;
$dark-forest-rgb: 85, 114, 109;
$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);
}