#4B7E76

CSS

:root {
  --turquoise-tortoise: #4b7e76;
  --turquoise-tortoise-rgb: 75 126 118;
  --turquoise-tortoise-oklch: oklch(0.555 0.057 183.1);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(171 25% 39%);
  border-color: oklch(0.555 0.057 183.1);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4b7e76;
  --color-turquoise-tortoise-50: #e4fbf7;
  --color-turquoise-tortoise-100: #d4eeea;
  --color-turquoise-tortoise-200: #baddd7;
  --color-turquoise-tortoise-300: #98c1bb;
  --color-turquoise-tortoise-400: #79aaa2;
  --color-turquoise-tortoise-500: #59938a;
  --color-turquoise-tortoise-600: #4c7c74;
  --color-turquoise-tortoise-700: #3d635d;
  --color-turquoise-tortoise-800: #2b4943;
  --color-turquoise-tortoise-900: #1d332f;
  --color-turquoise-tortoise-950: #0d1e1b;
}

SCSS

$turquoise-tortoise: #4b7e76;
$turquoise-tortoise-rgb: 75, 126, 118;
$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);
}