#339FFC

CSS

:root {
  --fresh-blue-of-bel-air: #339ffc;
  --fresh-blue-of-bel-air-rgb: 51 159 252;
  --fresh-blue-of-bel-air-oklch: oklch(0.687 0.167 249.2);
}

.element {
  color: var(--fresh-blue-of-bel-air);
  background-color: hsl(208 97% 59%);
  border-color: oklch(0.687 0.167 249.2);
}

Tailwind CSS v4

@theme {
  --color-fresh-blue-of-bel-air: #339ffc;
  --color-fresh-blue-of-bel-air-50: #d3f9ff;
  --color-fresh-blue-of-bel-air-100: #bfedff;
  --color-fresh-blue-of-bel-air-200: #9ed9ff;
  --color-fresh-blue-of-bel-air-300: #73bcff;
  --color-fresh-blue-of-bel-air-400: #41a3fc;
  --color-fresh-blue-of-bel-air-500: #0089ee;
  --color-fresh-blue-of-bel-air-600: #0074c9;
  --color-fresh-blue-of-bel-air-700: #005da1;
  --color-fresh-blue-of-bel-air-800: #004578;
  --color-fresh-blue-of-bel-air-900: #003055;
  --color-fresh-blue-of-bel-air-950: #001c39;
}

SCSS

$fresh-blue-of-bel-air: #339ffc;
$fresh-blue-of-bel-air-rgb: 51, 159, 252;
$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);
}