#00A4FF

CSS

:root {
  --fresh-blue-of-bel-air: #00a4ff;
  --fresh-blue-of-bel-air-rgb: 0 164 255;
  --fresh-blue-of-bel-air-oklch: oklch(0.694 0.173 244.6);
}

.element {
  color: var(--fresh-blue-of-bel-air);
  background-color: hsl(201 100% 50%);
  border-color: oklch(0.694 0.173 244.6);
}

Tailwind CSS v4

@theme {
  --color-fresh-blue-of-bel-air: #00a4ff;
  --color-fresh-blue-of-bel-air-50: #cefbff;
  --color-fresh-blue-of-bel-air-100: #b9eeff;
  --color-fresh-blue-of-bel-air-200: #96dcff;
  --color-fresh-blue-of-bel-air-300: #66bfff;
  --color-fresh-blue-of-bel-air-400: #23a6fc;
  --color-fresh-blue-of-bel-air-500: #008cef;
  --color-fresh-blue-of-bel-air-600: #0077c9;
  --color-fresh-blue-of-bel-air-700: #005fa2;
  --color-fresh-blue-of-bel-air-800: #004678;
  --color-fresh-blue-of-bel-air-900: #003155;
  --color-fresh-blue-of-bel-air-950: #001c39;
}

SCSS

$fresh-blue-of-bel-air: #00a4ff;
$fresh-blue-of-bel-air-rgb: 0, 164, 255;
$fresh-blue-of-bel-air-light: mix(#fff, $fresh-blue-of-bel-air, 20%);
$fresh-blue-of-bel-air-dark: mix(#000, $fresh-blue-of-bel-air, 20%);

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