#4A7E77

CSS

:root {
  --turquoise-tortoise: #4a7e77;
  --turquoise-tortoise-rgb: 74 126 119;
  --turquoise-tortoise-oklch: oklch(0.554 0.057 184.8);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(172 26% 39%);
  border-color: oklch(0.554 0.057 184.8);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4a7e77;
  --color-turquoise-tortoise-50: #e4fbf8;
  --color-turquoise-tortoise-100: #d4eeeb;
  --color-turquoise-tortoise-200: #baddd8;
  --color-turquoise-tortoise-300: #97c1bc;
  --color-turquoise-tortoise-400: #78aaa3;
  --color-turquoise-tortoise-500: #58938b;
  --color-turquoise-tortoise-600: #4b7c75;
  --color-turquoise-tortoise-700: #3c635e;
  --color-turquoise-tortoise-800: #2b4944;
  --color-turquoise-tortoise-900: #1d332f;
  --color-turquoise-tortoise-950: #0d1e1c;
}

SCSS

$turquoise-tortoise: #4a7e77;
$turquoise-tortoise-rgb: 74, 126, 119;
$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);
}