#567C6E

CSS

:root {
  --turquoise-tortoise: #567c6e;
  --turquoise-tortoise-rgb: 86 124 110;
  --turquoise-tortoise-oklch: oklch(0.553 0.048 169.6);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(158 18% 41%);
  border-color: oklch(0.553 0.048 169.6);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #567c6e;
  --color-turquoise-tortoise-50: #e8faf3;
  --color-turquoise-tortoise-100: #d9ede6;
  --color-turquoise-tortoise-200: #c1dbd2;
  --color-turquoise-tortoise-300: #a0c0b4;
  --color-turquoise-tortoise-400: #83a89a;
  --color-turquoise-tortoise-500: #669181;
  --color-turquoise-tortoise-600: #577b6d;
  --color-turquoise-tortoise-700: #456257;
  --color-turquoise-tortoise-800: #32483f;
  --color-turquoise-tortoise-900: #22322b;
  --color-turquoise-tortoise-950: #111e19;
}

SCSS

$turquoise-tortoise: #567c6e;
$turquoise-tortoise-rgb: 86, 124, 110;
$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);
}