#4E7468

CSS

:root {
  --turquoise-tortoise: #4e7468;
  --turquoise-tortoise-rgb: 78 116 104;
  --turquoise-tortoise-oklch: oklch(0.527 0.047 172.7);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(161 20% 38%);
  border-color: oklch(0.527 0.047 172.7);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4e7468;
  --color-turquoise-tortoise-50: #e8faf4;
  --color-turquoise-tortoise-100: #d9ede7;
  --color-turquoise-tortoise-200: #c1dbd3;
  --color-turquoise-tortoise-300: #9fc0b6;
  --color-turquoise-tortoise-400: #82a89c;
  --color-turquoise-tortoise-500: #669183;
  --color-turquoise-tortoise-600: #567a6f;
  --color-turquoise-tortoise-700: #456259;
  --color-turquoise-tortoise-800: #324840;
  --color-turquoise-tortoise-900: #22322c;
  --color-turquoise-tortoise-950: #111e19;
}

SCSS

$turquoise-tortoise: #4e7468;
$turquoise-tortoise-rgb: 78, 116, 104;
$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);
}