#4B7F7B

CSS

:root {
  --turquoise-tortoise: #4b7f7b;
  --turquoise-tortoise-rgb: 75 127 123;
  --turquoise-tortoise-oklch: oklch(0.559 0.056 189.4);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(175 26% 40%);
  border-color: oklch(0.559 0.056 189.4);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4b7f7b;
  --color-turquoise-tortoise-50: #e4fbf9;
  --color-turquoise-tortoise-100: #d4eeec;
  --color-turquoise-tortoise-200: #badcda;
  --color-turquoise-tortoise-300: #97c1be;
  --color-turquoise-tortoise-400: #78aaa5;
  --color-turquoise-tortoise-500: #58928e;
  --color-turquoise-tortoise-600: #4b7c78;
  --color-turquoise-tortoise-700: #3c6360;
  --color-turquoise-tortoise-800: #2b4946;
  --color-turquoise-tortoise-900: #1d3230;
  --color-turquoise-tortoise-950: #0d1e1c;
}

SCSS

$turquoise-tortoise: #4b7f7b;
$turquoise-tortoise-rgb: 75, 127, 123;
$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);
}