#517F70

CSS

:root {
  --turquoise-tortoise: #517f70;
  --turquoise-tortoise-rgb: 81 127 112;
  --turquoise-tortoise-oklch: oklch(0.559 0.056 171.6);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(160 22% 41%);
  border-color: oklch(0.559 0.056 171.6);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #517f70;
  --color-turquoise-tortoise-50: #e6fbf4;
  --color-turquoise-tortoise-100: #d6eee6;
  --color-turquoise-tortoise-200: #bddcd2;
  --color-turquoise-tortoise-300: #9bc1b5;
  --color-turquoise-tortoise-400: #7daa9a;
  --color-turquoise-tortoise-500: #5f9382;
  --color-turquoise-tortoise-600: #517c6e;
  --color-turquoise-tortoise-700: #406358;
  --color-turquoise-tortoise-800: #2e493f;
  --color-turquoise-tortoise-900: #1f322c;
  --color-turquoise-tortoise-950: #0f1e19;
}

SCSS

$turquoise-tortoise: #517f70;
$turquoise-tortoise-rgb: 81, 127, 112;
$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);
}