#3C7671

CSS

:root {
  --turquoise-tortoise: #3c7671;
  --turquoise-tortoise-rgb: 60 118 113;
  --turquoise-tortoise-oklch: oklch(0.525 0.062 188.2);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(175 33% 35%);
  border-color: oklch(0.525 0.062 188.2);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #3c7671;
  --color-turquoise-tortoise-50: #e2fbf9;
  --color-turquoise-tortoise-100: #d2efec;
  --color-turquoise-tortoise-200: #b7ddda;
  --color-turquoise-tortoise-300: #94c2be;
  --color-turquoise-tortoise-400: #73aba5;
  --color-turquoise-tortoise-500: #52948e;
  --color-turquoise-tortoise-600: #477d78;
  --color-turquoise-tortoise-700: #386460;
  --color-turquoise-tortoise-800: #284946;
  --color-turquoise-tortoise-900: #1b3330;
  --color-turquoise-tortoise-950: #0b1f1c;
}

SCSS

$turquoise-tortoise: #3c7671;
$turquoise-tortoise-rgb: 60, 118, 113;
$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);
}