#4D8074

CSS

:root {
  --turquoise-tortoise: #4d8074;
  --turquoise-tortoise-rgb: 77 128 116;
  --turquoise-tortoise-oklch: oklch(0.56 0.058 177.4);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(166 25% 40%);
  border-color: oklch(0.56 0.058 177.4);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4d8074;
  --color-turquoise-tortoise-50: #e4fbf5;
  --color-turquoise-tortoise-100: #d4efe8;
  --color-turquoise-tortoise-200: #baddd5;
  --color-turquoise-tortoise-300: #98c2b8;
  --color-turquoise-tortoise-400: #79aa9e;
  --color-turquoise-tortoise-500: #5a9386;
  --color-turquoise-tortoise-600: #4d7c71;
  --color-turquoise-tortoise-700: #3d645a;
  --color-turquoise-tortoise-800: #2c4941;
  --color-turquoise-tortoise-900: #1e332d;
  --color-turquoise-tortoise-950: #0d1e1a;
}

SCSS

$turquoise-tortoise: #4d8074;
$turquoise-tortoise-rgb: 77, 128, 116;
$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);
}