#50806F

CSS

:root {
  --turquoise-tortoise: #50806f;
  --turquoise-tortoise-rgb: 80 128 111;
  --turquoise-tortoise-oklch: oklch(0.56 0.059 169.7);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(159 23% 41%);
  border-color: oklch(0.56 0.059 169.7);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #50806f;
  --color-turquoise-tortoise-50: #e5fbf3;
  --color-turquoise-tortoise-100: #d5efe5;
  --color-turquoise-tortoise-200: #bcddd1;
  --color-turquoise-tortoise-300: #9ac2b4;
  --color-turquoise-tortoise-400: #7caa99;
  --color-turquoise-tortoise-500: #5d9380;
  --color-turquoise-tortoise-600: #4f7c6c;
  --color-turquoise-tortoise-700: #3f6457;
  --color-turquoise-tortoise-800: #2e493e;
  --color-turquoise-tortoise-900: #1f332b;
  --color-turquoise-tortoise-950: #0e1e18;
}

SCSS

$turquoise-tortoise: #50806f;
$turquoise-tortoise-rgb: 80, 128, 111;
$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);
}