#437F75

CSS

:root {
  --turquoise-tortoise: #437f75;
  --turquoise-tortoise-rgb: 67 127 117;
  --turquoise-tortoise-oklch: oklch(0.553 0.065 181.8);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(170 31% 38%);
  border-color: oklch(0.553 0.065 181.8);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #437f75;
  --color-turquoise-tortoise-50: #e2fcf7;
  --color-turquoise-tortoise-100: #d1efea;
  --color-turquoise-tortoise-200: #b6ded7;
  --color-turquoise-tortoise-300: #93c3bb;
  --color-turquoise-tortoise-400: #72aba1;
  --color-turquoise-tortoise-500: #519489;
  --color-turquoise-tortoise-600: #457e74;
  --color-turquoise-tortoise-700: #37655d;
  --color-turquoise-tortoise-800: #274a43;
  --color-turquoise-tortoise-900: #1a332e;
  --color-turquoise-tortoise-950: #0a1f1b;
}

SCSS

$turquoise-tortoise: #437f75;
$turquoise-tortoise-rgb: 67, 127, 117;
$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);
}