#00BFD3

CSS

:root {
  --caribbean-blue: #00bfd3;
  --caribbean-blue-rgb: 0 191 211;
  --caribbean-blue-oklch: oklch(0.736 0.127 208);
}

.element {
  color: var(--caribbean-blue);
  background-color: hsl(186 100% 41%);
  border-color: oklch(0.736 0.127 208);
}

Tailwind CSS v4

@theme {
  --color-caribbean-blue: #00bfd3;
  --color-caribbean-blue-50: #ccffff;
  --color-caribbean-blue-100: #b7f4ff;
  --color-caribbean-blue-200: #92e4f2;
  --color-caribbean-blue-300: #5ec9db;
  --color-caribbean-blue-400: #01b3c5;
  --color-caribbean-blue-500: #009cb2;
  --color-caribbean-blue-600: #008496;
  --color-caribbean-blue-700: #006978;
  --color-caribbean-blue-800: #004e58;
  --color-caribbean-blue-900: #00363d;
  --color-caribbean-blue-950: #002127;
}

SCSS

$caribbean-blue: #00bfd3;
$caribbean-blue-rgb: 0, 191, 211;
$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);
}