#478079

CSS

:root {
  --turquoise-tortoise: #478079;
  --turquoise-tortoise-rgb: 71 128 121;
  --turquoise-tortoise-oklch: oklch(0.559 0.061 185.5);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(173 29% 39%);
  border-color: oklch(0.559 0.061 185.5);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #478079;
  --color-turquoise-tortoise-50: #e3fbf8;
  --color-turquoise-tortoise-100: #d2efeb;
  --color-turquoise-tortoise-200: #b8ddd9;
  --color-turquoise-tortoise-300: #94c2bd;
  --color-turquoise-tortoise-400: #74aba3;
  --color-turquoise-tortoise-500: #53948c;
  --color-turquoise-tortoise-600: #477d76;
  --color-turquoise-tortoise-700: #39645f;
  --color-turquoise-tortoise-800: #284944;
  --color-turquoise-tortoise-900: #1b332f;
  --color-turquoise-tortoise-950: #0b1f1c;
}

SCSS

$turquoise-tortoise: #478079;
$turquoise-tortoise-rgb: 71, 128, 121;
$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);
}