#45807C

CSS

:root {
  --turquoise-tortoise: #45807c;
  --turquoise-tortoise-rgb: 69 128 124;
  --turquoise-tortoise-oklch: oklch(0.559 0.062 189.8);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(176 30% 39%);
  border-color: oklch(0.559 0.062 189.8);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #45807c;
  --color-turquoise-tortoise-50: #e2fbfa;
  --color-turquoise-tortoise-100: #d1efed;
  --color-turquoise-tortoise-200: #b7dddb;
  --color-turquoise-tortoise-300: #93c2bf;
  --color-turquoise-tortoise-400: #73aba6;
  --color-turquoise-tortoise-500: #51948f;
  --color-turquoise-tortoise-600: #467d79;
  --color-turquoise-tortoise-700: #376461;
  --color-turquoise-tortoise-800: #274946;
  --color-turquoise-tortoise-900: #1a3331;
  --color-turquoise-tortoise-950: #0a1f1d;
}

SCSS

$turquoise-tortoise: #45807c;
$turquoise-tortoise-rgb: 69, 128, 124;
$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);
}