#40A1E8

CSS

:root {
  --fresh-blue-of-bel-air: #40a1e8;
  --fresh-blue-of-bel-air-rgb: 64 161 232;
  --fresh-blue-of-bel-air-oklch: oklch(0.684 0.138 244.2);
}

.element {
  color: var(--fresh-blue-of-bel-air);
  background-color: hsl(205 79% 58%);
  border-color: oklch(0.684 0.138 244.2);
}

Tailwind CSS v4

@theme {
  --color-fresh-blue-of-bel-air: #40a1e8;
  --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: #7abefa;
  --color-fresh-blue-of-bel-air-400: #4da6ea;
  --color-fresh-blue-of-bel-air-500: #078dda;
  --color-fresh-blue-of-bel-air-600: #1077b8;
  --color-fresh-blue-of-bel-air-700: #0e6094;
  --color-fresh-blue-of-bel-air-800: #01476e;
  --color-fresh-blue-of-bel-air-900: #03314d;
  --color-fresh-blue-of-bel-air-950: #001d33;
}

SCSS

$fresh-blue-of-bel-air: #40a1e8;
$fresh-blue-of-bel-air-rgb: 64, 161, 232;
$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);
}