#00BBDA

CSS

:root {
  --caribbean-blue: #00bbda;
  --caribbean-blue-rgb: 0 187 218;
  --caribbean-blue-oklch: oklch(0.729 0.129 215.3);
}

.element {
  color: var(--caribbean-blue);
  background-color: hsl(189 100% 43%);
  border-color: oklch(0.729 0.129 215.3);
}

Tailwind CSS v4

@theme {
  --color-caribbean-blue: #00bbda;
  --color-caribbean-blue-50: #ccffff;
  --color-caribbean-blue-100: #b7f3ff;
  --color-caribbean-blue-200: #92e2f9;
  --color-caribbean-blue-300: #5fc8e3;
  --color-caribbean-blue-400: #0bb1ce;
  --color-caribbean-blue-500: #009abb;
  --color-caribbean-blue-600: #00829e;
  --color-caribbean-blue-700: #00687f;
  --color-caribbean-blue-800: #004d5d;
  --color-caribbean-blue-900: #003641;
  --color-caribbean-blue-950: #00202a;
}

SCSS

$caribbean-blue: #00bbda;
$caribbean-blue-rgb: 0, 187, 218;
$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);
}