#498077

CSS

:root {
  --turquoise-tortoise: #498077;
  --turquoise-tortoise-rgb: 73 128 119;
  --turquoise-tortoise-oklch: oklch(0.559 0.06 182.4);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(170 27% 39%);
  border-color: oklch(0.559 0.06 182.4);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #498077;
  --color-turquoise-tortoise-50: #e3fbf7;
  --color-turquoise-tortoise-100: #d3efea;
  --color-turquoise-tortoise-200: #b9ddd7;
  --color-turquoise-tortoise-300: #95c2bb;
  --color-turquoise-tortoise-400: #76aba1;
  --color-turquoise-tortoise-500: #569489;
  --color-turquoise-tortoise-600: #497d74;
  --color-turquoise-tortoise-700: #3a645d;
  --color-turquoise-tortoise-800: #2a4943;
  --color-turquoise-tortoise-900: #1c332e;
  --color-turquoise-tortoise-950: #0c1f1b;
}

SCSS

$turquoise-tortoise: #498077;
$turquoise-tortoise-rgb: 73, 128, 119;
$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);
}