#42A1EB

CSS

:root {
  --fresh-blue-of-bel-air: #42a1eb;
  --fresh-blue-of-bel-air-rgb: 66 161 235;
  --fresh-blue-of-bel-air-oklch: oklch(0.686 0.141 245.6);
}

.element {
  color: var(--fresh-blue-of-bel-air);
  background-color: hsl(206 81% 59%);
  border-color: oklch(0.686 0.141 245.6);
}

Tailwind CSS v4

@theme {
  --color-fresh-blue-of-bel-air: #42a1eb;
  --color-fresh-blue-of-bel-air-50: #d6faff;
  --color-fresh-blue-of-bel-air-100: #c3edff;
  --color-fresh-blue-of-bel-air-200: #a4daff;
  --color-fresh-blue-of-bel-air-300: #7bbefc;
  --color-fresh-blue-of-bel-air-400: #4da5ec;
  --color-fresh-blue-of-bel-air-500: #0d8cdc;
  --color-fresh-blue-of-bel-air-600: #1377ba;
  --color-fresh-blue-of-bel-air-700: #105f95;
  --color-fresh-blue-of-bel-air-800: #02466f;
  --color-fresh-blue-of-bel-air-900: #03314e;
  --color-fresh-blue-of-bel-air-950: #001c34;
}

SCSS

$fresh-blue-of-bel-air: #42a1eb;
$fresh-blue-of-bel-air-rgb: 66, 161, 235;
$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);
}