#447F77

CSS

:root {
  --turquoise-tortoise: #447f77;
  --turquoise-tortoise-rgb: 68 127 119;
  --turquoise-tortoise-oklch: oklch(0.554 0.063 184.3);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(172 30% 38%);
  border-color: oklch(0.554 0.063 184.3);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #447f77;
  --color-turquoise-tortoise-50: #e2fbf8;
  --color-turquoise-tortoise-100: #d1efeb;
  --color-turquoise-tortoise-200: #b7ded8;
  --color-turquoise-tortoise-300: #93c2bc;
  --color-turquoise-tortoise-400: #73aba3;
  --color-turquoise-tortoise-500: #52948b;
  --color-turquoise-tortoise-600: #467d76;
  --color-turquoise-tortoise-700: #38645e;
  --color-turquoise-tortoise-800: #284a44;
  --color-turquoise-tortoise-900: #1b332f;
  --color-turquoise-tortoise-950: #0b1f1c;
}

SCSS

$turquoise-tortoise: #447f77;
$turquoise-tortoise-rgb: 68, 127, 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);
}