#00C1E3

CSS

:root {
  --caribbean-blue: #00c1e3;
  --caribbean-blue-rgb: 0 193 227;
  --caribbean-blue-oklch: oklch(0.747 0.133 216.5);
}

.element {
  color: var(--caribbean-blue);
  background-color: hsl(189 100% 45%);
  border-color: oklch(0.747 0.133 216.5);
}

Tailwind CSS v4

@theme {
  --color-caribbean-blue: #00c1e3;
  --color-caribbean-blue-50: #cbffff;
  --color-caribbean-blue-100: #b6f3ff;
  --color-caribbean-blue-200: #90e2fb;
  --color-caribbean-blue-300: #5cc8e5;
  --color-caribbean-blue-400: #00b1d1;
  --color-caribbean-blue-500: #009abe;
  --color-caribbean-blue-600: #0082a1;
  --color-caribbean-blue-700: #006881;
  --color-caribbean-blue-800: #004d5e;
  --color-caribbean-blue-900: #003642;
  --color-caribbean-blue-950: #00202b;
}

SCSS

$caribbean-blue: #00c1e3;
$caribbean-blue-rgb: 0, 193, 227;
$caribbean-blue-light: mix(#fff, $caribbean-blue, 20%);
$caribbean-blue-dark: mix(#000, $caribbean-blue, 20%);

.element {
  color: $caribbean-blue;
  box-shadow: 0 0 0 2px rgba($caribbean-blue, 0.35);
}