#498078

CSS

:root {
  --turquoise-tortoise: #498078;
  --turquoise-tortoise-rgb: 73 128 120;
  --turquoise-tortoise-oklch: oklch(0.559 0.06 183.8);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(171 27% 39%);
  border-color: oklch(0.559 0.06 183.8);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #498078;
  --color-turquoise-tortoise-50: #e3fbf7;
  --color-turquoise-tortoise-100: #d3efeb;
  --color-turquoise-tortoise-200: #b9ddd8;
  --color-turquoise-tortoise-300: #95c2bc;
  --color-turquoise-tortoise-400: #76aaa2;
  --color-turquoise-tortoise-500: #55938a;
  --color-turquoise-tortoise-600: #497d75;
  --color-turquoise-tortoise-700: #3a645e;
  --color-turquoise-tortoise-800: #2a4944;
  --color-turquoise-tortoise-900: #1c332f;
  --color-turquoise-tortoise-950: #0c1e1b;
}

SCSS

$turquoise-tortoise: #498078;
$turquoise-tortoise-rgb: 73, 128, 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);
}