#478077

CSS

:root {
  --turquoise-tortoise: #478077;
  --turquoise-tortoise-rgb: 71 128 119;
  --turquoise-tortoise-oklch: oklch(0.558 0.062 182.7);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(171 29% 39%);
  border-color: oklch(0.558 0.062 182.7);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #478077;
  --color-turquoise-tortoise-50: #e3fbf7;
  --color-turquoise-tortoise-100: #d2efea;
  --color-turquoise-tortoise-200: #b8ddd7;
  --color-turquoise-tortoise-300: #94c2bb;
  --color-turquoise-tortoise-400: #74aba2;
  --color-turquoise-tortoise-500: #54948a;
  --color-turquoise-tortoise-600: #487d75;
  --color-turquoise-tortoise-700: #39645d;
  --color-turquoise-tortoise-800: #294a43;
  --color-turquoise-tortoise-900: #1b332f;
  --color-turquoise-tortoise-950: #0b1f1b;
}

SCSS

$turquoise-tortoise: #478077;
$turquoise-tortoise-rgb: 71, 128, 119;
$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);
}