#507F78

CSS

:root {
  --turquoise-tortoise: #507f78;
  --turquoise-tortoise-rgb: 80 127 120;
  --turquoise-tortoise-oklch: oklch(0.561 0.053 184);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(171 23% 41%);
  border-color: oklch(0.561 0.053 184);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #507f78;
  --color-turquoise-tortoise-50: #e5faf7;
  --color-turquoise-tortoise-100: #d5eeea;
  --color-turquoise-tortoise-200: #bcdcd7;
  --color-turquoise-tortoise-300: #9ac1bb;
  --color-turquoise-tortoise-400: #7ca9a2;
  --color-turquoise-tortoise-500: #5d928a;
  --color-turquoise-tortoise-600: #4f7b75;
  --color-turquoise-tortoise-700: #3f635d;
  --color-turquoise-tortoise-800: #2d4844;
  --color-turquoise-tortoise-900: #1f322f;
  --color-turquoise-tortoise-950: #0e1e1b;
}

SCSS

$turquoise-tortoise: #507f78;
$turquoise-tortoise-rgb: 80, 127, 120;
$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);
}