#18A2F6

CSS

:root {
  --fresh-blue-of-bel-air: #18a2f6;
  --fresh-blue-of-bel-air-rgb: 24 162 246;
  --fresh-blue-of-bel-air-oklch: oklch(0.686 0.163 243.8);
}

.element {
  color: var(--fresh-blue-of-bel-air);
  background-color: hsl(203 93% 53%);
  border-color: oklch(0.686 0.163 243.8);
}

Tailwind CSS v4

@theme {
  --color-fresh-blue-of-bel-air: #18a2f6;
  --color-fresh-blue-of-bel-air-50: #d0fbff;
  --color-fresh-blue-of-bel-air-100: #bbeeff;
  --color-fresh-blue-of-bel-air-200: #99dcff;
  --color-fresh-blue-of-bel-air-300: #6bbfff;
  --color-fresh-blue-of-bel-air-400: #30a7f6;
  --color-fresh-blue-of-bel-air-500: #008de8;
  --color-fresh-blue-of-bel-air-600: #0077c4;
  --color-fresh-blue-of-bel-air-700: #00609d;
  --color-fresh-blue-of-bel-air-800: #004775;
  --color-fresh-blue-of-bel-air-900: #003152;
  --color-fresh-blue-of-bel-air-950: #001d37;
}

SCSS

$fresh-blue-of-bel-air: #18a2f6;
$fresh-blue-of-bel-air-rgb: 24, 162, 246;
$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);
}