#39807B

CSS

:root {
  --turquoise-tortoise: #39807b;
  --turquoise-tortoise-rgb: 57 128 123;
  --turquoise-tortoise-oklch: oklch(0.553 0.072 189.1);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(176 38% 36%);
  border-color: oklch(0.553 0.072 189.1);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #39807b;
  --color-turquoise-tortoise-50: #dffcfa;
  --color-turquoise-tortoise-100: #cef0ed;
  --color-turquoise-tortoise-200: #b2dfdb;
  --color-turquoise-tortoise-300: #8dc4c0;
  --color-turquoise-tortoise-400: #6aaca7;
  --color-turquoise-tortoise-500: #469690;
  --color-turquoise-tortoise-600: #3c7e7a;
  --color-turquoise-tortoise-700: #306561;
  --color-turquoise-tortoise-800: #224a46;
  --color-turquoise-tortoise-900: #163431;
  --color-turquoise-tortoise-950: #071f1d;
}

SCSS

$turquoise-tortoise: #39807b;
$turquoise-tortoise-rgb: 57, 128, 123;
$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);
}