#3D7F77

CSS

:root {
  --turquoise-tortoise: #3d7f77;
  --turquoise-tortoise-rgb: 61 127 119;
  --turquoise-tortoise-oklch: oklch(0.551 0.069 185);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(173 35% 37%);
  border-color: oklch(0.551 0.069 185);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #3d7f77;
  --color-turquoise-tortoise-50: #e0fcf8;
  --color-turquoise-tortoise-100: #cff0ec;
  --color-turquoise-tortoise-200: #b4ded9;
  --color-turquoise-tortoise-300: #8fc3bd;
  --color-turquoise-tortoise-400: #6eaca4;
  --color-turquoise-tortoise-500: #4b958c;
  --color-turquoise-tortoise-600: #407e76;
  --color-turquoise-tortoise-700: #33655f;
  --color-turquoise-tortoise-800: #244a45;
  --color-turquoise-tortoise-900: #18342f;
  --color-turquoise-tortoise-950: #091f1c;
}

SCSS

$turquoise-tortoise: #3d7f77;
$turquoise-tortoise-rgb: 61, 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);
}