#4E8070

CSS

:root {
  --turquoise-tortoise: #4e8070;
  --turquoise-tortoise-rgb: 78 128 112;
  --turquoise-tortoise-oklch: oklch(0.559 0.06 171.7);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(161 24% 40%);
  border-color: oklch(0.559 0.06 171.7);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4e8070;
  --color-turquoise-tortoise-50: #e5fbf4;
  --color-turquoise-tortoise-100: #d5efe6;
  --color-turquoise-tortoise-200: #bbddd2;
  --color-turquoise-tortoise-300: #98c2b5;
  --color-turquoise-tortoise-400: #7aaa9a;
  --color-turquoise-tortoise-500: #5b9381;
  --color-turquoise-tortoise-600: #4e7d6d;
  --color-turquoise-tortoise-700: #3e6458;
  --color-turquoise-tortoise-800: #2d493f;
  --color-turquoise-tortoise-900: #1e332b;
  --color-turquoise-tortoise-950: #0e1e19;
}

SCSS

$turquoise-tortoise: #4e8070;
$turquoise-tortoise-rgb: 78, 128, 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);
}