#437570

CSS

:root {
  --turquoise-tortoise: #437570;
  --turquoise-tortoise-rgb: 67 117 112;
  --turquoise-tortoise-oklch: oklch(0.526 0.055 187.4);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(174 27% 36%);
  border-color: oklch(0.526 0.055 187.4);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #437570;
  --color-turquoise-tortoise-50: #e4fbf8;
  --color-turquoise-tortoise-100: #d4eeec;
  --color-turquoise-tortoise-200: #bbdcd9;
  --color-turquoise-tortoise-300: #98c1bd;
  --color-turquoise-tortoise-400: #79a9a4;
  --color-turquoise-tortoise-500: #5a928c;
  --color-turquoise-tortoise-600: #4d7c77;
  --color-turquoise-tortoise-700: #3d635f;
  --color-turquoise-tortoise-800: #2c4945;
  --color-turquoise-tortoise-900: #1d3230;
  --color-turquoise-tortoise-950: #0d1e1c;
}

SCSS

$turquoise-tortoise: #437570;
$turquoise-tortoise-rgb: 67, 117, 112;
$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);
}