#417E7C

CSS

:root {
  --turquoise-tortoise: #417e7c;
  --turquoise-tortoise-rgb: 65 126 124;
  --turquoise-tortoise-oklch: oklch(0.552 0.063 192.7);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(178 32% 37%);
  border-color: oklch(0.552 0.063 192.7);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #417e7c;
  --color-turquoise-tortoise-50: #e1fbfb;
  --color-turquoise-tortoise-100: #d1efee;
  --color-turquoise-tortoise-200: #b6dddc;
  --color-turquoise-tortoise-300: #92c2c1;
  --color-turquoise-tortoise-400: #71aba8;
  --color-turquoise-tortoise-500: #4f9491;
  --color-turquoise-tortoise-600: #447d7b;
  --color-turquoise-tortoise-700: #366462;
  --color-turquoise-tortoise-800: #264a47;
  --color-turquoise-tortoise-900: #193331;
  --color-turquoise-tortoise-950: #0a1f1d;
}

SCSS

$turquoise-tortoise: #417e7c;
$turquoise-tortoise-rgb: 65, 126, 124;
$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);
}