#4F7F7B

CSS

:root {
  --turquoise-tortoise: #4f7f7b;
  --turquoise-tortoise-rgb: 79 127 123;
  --turquoise-tortoise-oklch: oklch(0.561 0.053 189.1);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(175 23% 40%);
  border-color: oklch(0.561 0.053 189.1);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4f7f7b;
  --color-turquoise-tortoise-50: #e5faf9;
  --color-turquoise-tortoise-100: #d5eeec;
  --color-turquoise-tortoise-200: #bcdcd9;
  --color-turquoise-tortoise-300: #99c0be;
  --color-turquoise-tortoise-400: #7ba9a5;
  --color-turquoise-tortoise-500: #5c928d;
  --color-turquoise-tortoise-600: #4e7b77;
  --color-turquoise-tortoise-700: #3e6360;
  --color-turquoise-tortoise-800: #2d4845;
  --color-turquoise-tortoise-900: #1e3230;
  --color-turquoise-tortoise-950: #0e1e1c;
}

SCSS

$turquoise-tortoise: #4f7f7b;
$turquoise-tortoise-rgb: 79, 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);
}