#397672

CSS

:root {
  --turquoise-tortoise: #397672;
  --turquoise-tortoise-rgb: 57 118 114;
  --turquoise-tortoise-oklch: oklch(0.524 0.064 189.7);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(176 35% 34%);
  border-color: oklch(0.524 0.064 189.7);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #397672;
  --color-turquoise-tortoise-50: #e1fbfa;
  --color-turquoise-tortoise-100: #d1efed;
  --color-turquoise-tortoise-200: #b6dddb;
  --color-turquoise-tortoise-300: #92c2bf;
  --color-turquoise-tortoise-400: #71aba6;
  --color-turquoise-tortoise-500: #50948f;
  --color-turquoise-tortoise-600: #447d79;
  --color-turquoise-tortoise-700: #366461;
  --color-turquoise-tortoise-800: #264a46;
  --color-turquoise-tortoise-900: #1a3331;
  --color-turquoise-tortoise-950: #0a1f1d;
}

SCSS

$turquoise-tortoise: #397672;
$turquoise-tortoise-rgb: 57, 118, 114;
$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);
}