#4D8072

CSS

:root {
  --turquoise-tortoise: #4d8072;
  --turquoise-tortoise-rgb: 77 128 114;
  --turquoise-tortoise-oklch: oklch(0.559 0.06 174.6);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(164 25% 40%);
  border-color: oklch(0.559 0.06 174.6);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4d8072;
  --color-turquoise-tortoise-50: #e4fbf5;
  --color-turquoise-tortoise-100: #d4efe7;
  --color-turquoise-tortoise-200: #bbddd3;
  --color-turquoise-tortoise-300: #98c2b6;
  --color-turquoise-tortoise-400: #79aa9c;
  --color-turquoise-tortoise-500: #5a9384;
  --color-turquoise-tortoise-600: #4d7d6f;
  --color-turquoise-tortoise-700: #3d6459;
  --color-turquoise-tortoise-800: #2c4940;
  --color-turquoise-tortoise-900: #1e332c;
  --color-turquoise-tortoise-950: #0d1e19;
}

SCSS

$turquoise-tortoise: #4d8072;
$turquoise-tortoise-rgb: 77, 128, 114;
$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);
}