#4D837C

CSS

:root {
  --turquoise-tortoise: #4d837c;
  --turquoise-tortoise-rgb: 77 131 124;
  --turquoise-tortoise-oklch: oklch(0.57 0.059 185.2);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(172 26% 41%);
  border-color: oklch(0.57 0.059 185.2);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4d837c;
  --color-turquoise-tortoise-50: #e3fbf8;
  --color-turquoise-tortoise-100: #d3efeb;
  --color-turquoise-tortoise-200: #b9ddd8;
  --color-turquoise-tortoise-300: #96c2bc;
  --color-turquoise-tortoise-400: #76aaa3;
  --color-turquoise-tortoise-500: #56938b;
  --color-turquoise-tortoise-600: #4a7c76;
  --color-turquoise-tortoise-700: #3b645e;
  --color-turquoise-tortoise-800: #2a4944;
  --color-turquoise-tortoise-900: #1c332f;
  --color-turquoise-tortoise-950: #0c1e1c;
}

SCSS

$turquoise-tortoise: #4d837c;
$turquoise-tortoise-rgb: 77, 131, 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);
}