#457E7C

CSS

:root {
  --turquoise-tortoise: #457e7c;
  --turquoise-tortoise-rgb: 69 126 124;
  --turquoise-tortoise-oklch: oklch(0.554 0.06 192.6);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(178 29% 38%);
  border-color: oklch(0.554 0.06 192.6);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #457e7c;
  --color-turquoise-tortoise-50: #e2fbfa;
  --color-turquoise-tortoise-100: #d2efee;
  --color-turquoise-tortoise-200: #b8dddc;
  --color-turquoise-tortoise-300: #94c2c1;
  --color-turquoise-tortoise-400: #74aaa8;
  --color-turquoise-tortoise-500: #539391;
  --color-turquoise-tortoise-600: #477c7a;
  --color-turquoise-tortoise-700: #386462;
  --color-turquoise-tortoise-800: #284947;
  --color-turquoise-tortoise-900: #1b3331;
  --color-turquoise-tortoise-950: #0b1e1d;
}

SCSS

$turquoise-tortoise: #457e7c;
$turquoise-tortoise-rgb: 69, 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);
}