#3D9FF7

CSS

:root {
  --fresh-blue-of-bel-air: #3d9ff7;
  --fresh-blue-of-bel-air-rgb: 61 159 247;
  --fresh-blue-of-bel-air-oklch: oklch(0.687 0.158 249.4);
}

.element {
  color: var(--fresh-blue-of-bel-air);
  background-color: hsl(208 92% 60%);
  border-color: oklch(0.687 0.158 249.4);
}

Tailwind CSS v4

@theme {
  --color-fresh-blue-of-bel-air: #3d9ff7;
  --color-fresh-blue-of-bel-air-50: #d5f9ff;
  --color-fresh-blue-of-bel-air-100: #c2ecff;
  --color-fresh-blue-of-bel-air-200: #a2d9ff;
  --color-fresh-blue-of-bel-air-300: #78bcff;
  --color-fresh-blue-of-bel-air-400: #49a3f7;
  --color-fresh-blue-of-bel-air-500: #0089e9;
  --color-fresh-blue-of-bel-air-600: #0874c4;
  --color-fresh-blue-of-bel-air-700: #095d9e;
  --color-fresh-blue-of-bel-air-800: #004575;
  --color-fresh-blue-of-bel-air-900: #003053;
  --color-fresh-blue-of-bel-air-950: #001c38;
}

SCSS

$fresh-blue-of-bel-air: #3d9ff7;
$fresh-blue-of-bel-air-rgb: 61, 159, 247;
$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);
}