#3B8079

CSS

:root {
  --turquoise-tortoise: #3b8079;
  --turquoise-tortoise-rgb: 59 128 121;
  --turquoise-tortoise-oklch: oklch(0.553 0.071 186.5);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(174 37% 37%);
  border-color: oklch(0.553 0.071 186.5);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #3b8079;
  --color-turquoise-tortoise-50: #dffcf9;
  --color-turquoise-tortoise-100: #cef0ec;
  --color-turquoise-tortoise-200: #b3dfda;
  --color-turquoise-tortoise-300: #8ec4be;
  --color-turquoise-tortoise-400: #6caca5;
  --color-turquoise-tortoise-500: #48958e;
  --color-turquoise-tortoise-600: #3e7e78;
  --color-turquoise-tortoise-700: #316560;
  --color-turquoise-tortoise-800: #234a45;
  --color-turquoise-tortoise-900: #173430;
  --color-turquoise-tortoise-950: #081f1c;
}

SCSS

$turquoise-tortoise: #3b8079;
$turquoise-tortoise-rgb: 59, 128, 121;
$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);
}