#478175

CSS

:root {
  --turquoise-tortoise: #478175;
  --turquoise-tortoise-rgb: 71 129 117;
  --turquoise-tortoise-oklch: oklch(0.56 0.064 178.9);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(168 29% 39%);
  border-color: oklch(0.56 0.064 178.9);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #478175;
  --color-turquoise-tortoise-50: #e2fcf6;
  --color-turquoise-tortoise-100: #d2efe9;
  --color-turquoise-tortoise-200: #b7ded6;
  --color-turquoise-tortoise-300: #94c3b9;
  --color-turquoise-tortoise-400: #74ab9f;
  --color-turquoise-tortoise-500: #539487;
  --color-turquoise-tortoise-600: #477d72;
  --color-turquoise-tortoise-700: #39645b;
  --color-turquoise-tortoise-800: #284a42;
  --color-turquoise-tortoise-900: #1b332d;
  --color-turquoise-tortoise-950: #0b1f1a;
}

SCSS

$turquoise-tortoise: #478175;
$turquoise-tortoise-rgb: 71, 129, 117;
$turquoise-tortoise-light: mix(#fff, $turquoise-tortoise, 20%);
$turquoise-tortoise-dark: mix(#000, $turquoise-tortoise, 20%);

.element {
  color: $turquoise-tortoise;
  box-shadow: 0 0 0 2px rgba($turquoise-tortoise, 0.35);
}