#4E7E71

CSS

:root {
  --turquoise-tortoise: #4e7e71;
  --turquoise-tortoise-rgb: 78 126 113;
  --turquoise-tortoise-oklch: oklch(0.555 0.056 175.1);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(164 24% 40%);
  border-color: oklch(0.555 0.056 175.1);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4e7e71;
  --color-turquoise-tortoise-50: #e5fbf5;
  --color-turquoise-tortoise-100: #d5eee7;
  --color-turquoise-tortoise-200: #bcddd4;
  --color-turquoise-tortoise-300: #99c1b7;
  --color-turquoise-tortoise-400: #7baa9c;
  --color-turquoise-tortoise-500: #5d9384;
  --color-turquoise-tortoise-600: #4f7c70;
  --color-turquoise-tortoise-700: #3f6359;
  --color-turquoise-tortoise-800: #2d4940;
  --color-turquoise-tortoise-900: #1f332c;
  --color-turquoise-tortoise-950: #0e1e19;
}

SCSS

$turquoise-tortoise: #4e7e71;
$turquoise-tortoise-rgb: 78, 126, 113;
$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);
}