#527D73

CSS

:root {
  --turquoise-tortoise: #527d73;
  --turquoise-tortoise-rgb: 82 125 115;
  --turquoise-tortoise-oklch: oklch(0.555 0.05 178.1);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(166 21% 41%);
  border-color: oklch(0.555 0.05 178.1);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #527d73;
  --color-turquoise-tortoise-50: #e7faf6;
  --color-turquoise-tortoise-100: #d7eee8;
  --color-turquoise-tortoise-200: #bedcd5;
  --color-turquoise-tortoise-300: #9cc0b8;
  --color-turquoise-tortoise-400: #7fa99e;
  --color-turquoise-tortoise-500: #619186;
  --color-turquoise-tortoise-600: #537b72;
  --color-turquoise-tortoise-700: #42625b;
  --color-turquoise-tortoise-800: #2f4842;
  --color-turquoise-tortoise-900: #20322d;
  --color-turquoise-tortoise-950: #0f1e1a;
}

SCSS

$turquoise-tortoise: #527d73;
$turquoise-tortoise-rgb: 82, 125, 115;
$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);
}