#4A7F7C

CSS

:root {
  --turquoise-tortoise: #4a7f7c;
  --turquoise-tortoise-rgb: 74 127 124;
  --turquoise-tortoise-oklch: oklch(0.559 0.057 191);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(177 26% 39%);
  border-color: oklch(0.559 0.057 191);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4a7f7c;
  --color-turquoise-tortoise-50: #e4fbf9;
  --color-turquoise-tortoise-100: #d3eeed;
  --color-turquoise-tortoise-200: #b9dcdb;
  --color-turquoise-tortoise-300: #96c1bf;
  --color-turquoise-tortoise-400: #77aaa6;
  --color-turquoise-tortoise-500: #57938f;
  --color-turquoise-tortoise-600: #4a7c79;
  --color-turquoise-tortoise-700: #3b6361;
  --color-turquoise-tortoise-800: #2a4946;
  --color-turquoise-tortoise-900: #1c3331;
  --color-turquoise-tortoise-950: #0c1e1d;
}

SCSS

$turquoise-tortoise: #4a7f7c;
$turquoise-tortoise-rgb: 74, 127, 124;
$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);
}