#4A7E78

CSS

:root {
  --turquoise-tortoise: #4a7e78;
  --turquoise-tortoise-rgb: 74 126 120;
  --turquoise-tortoise-oklch: oklch(0.555 0.057 186.3);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(173 26% 39%);
  border-color: oklch(0.555 0.057 186.3);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #4a7e78;
  --color-turquoise-tortoise-50: #e4fbf8;
  --color-turquoise-tortoise-100: #d4eeeb;
  --color-turquoise-tortoise-200: #baddd9;
  --color-turquoise-tortoise-300: #97c1bd;
  --color-turquoise-tortoise-400: #78aaa3;
  --color-turquoise-tortoise-500: #58938c;
  --color-turquoise-tortoise-600: #4b7c76;
  --color-turquoise-tortoise-700: #3c635f;
  --color-turquoise-tortoise-800: #2b4945;
  --color-turquoise-tortoise-900: #1d332f;
  --color-turquoise-tortoise-950: #0d1e1c;
}

SCSS

$turquoise-tortoise: #4a7e78;
$turquoise-tortoise-rgb: 74, 126, 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);
}