#40A1E9

CSS

:root {
  --fresh-blue-of-bel-air: #40a1e9;
  --fresh-blue-of-bel-air-rgb: 64 161 233;
  --fresh-blue-of-bel-air-oklch: oklch(0.684 0.139 244.5);
}

.element {
  color: var(--fresh-blue-of-bel-air);
  background-color: hsl(206 79% 58%);
  border-color: oklch(0.684 0.139 244.5);
}

Tailwind CSS v4

@theme {
  --color-fresh-blue-of-bel-air: #40a1e9;
  --color-fresh-blue-of-bel-air-50: #d6faff;
  --color-fresh-blue-of-bel-air-100: #c3edff;
  --color-fresh-blue-of-bel-air-200: #a3dbff;
  --color-fresh-blue-of-bel-air-300: #7abefb;
  --color-fresh-blue-of-bel-air-400: #4ca6ea;
  --color-fresh-blue-of-bel-air-500: #078ddb;
  --color-fresh-blue-of-bel-air-600: #1077b9;
  --color-fresh-blue-of-bel-air-700: #0e5f94;
  --color-fresh-blue-of-bel-air-800: #01466e;
  --color-fresh-blue-of-bel-air-900: #02314d;
  --color-fresh-blue-of-bel-air-950: #001d33;
}

SCSS

$fresh-blue-of-bel-air: #40a1e9;
$fresh-blue-of-bel-air-rgb: 64, 161, 233;
$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);
}