#3DA0F0

CSS

:root {
  --fresh-blue-of-bel-air: #3da0f0;
  --fresh-blue-of-bel-air-rgb: 61 160 240;
  --fresh-blue-of-bel-air-oklch: oklch(0.685 0.149 246.9);
}

.element {
  color: var(--fresh-blue-of-bel-air);
  background-color: hsl(207 86% 59%);
  border-color: oklch(0.685 0.149 246.9);
}

Tailwind CSS v4

@theme {
  --color-fresh-blue-of-bel-air: #3da0f0;
  --color-fresh-blue-of-bel-air-50: #d5faff;
  --color-fresh-blue-of-bel-air-100: #c2edff;
  --color-fresh-blue-of-bel-air-200: #a2daff;
  --color-fresh-blue-of-bel-air-300: #78bdff;
  --color-fresh-blue-of-bel-air-400: #4aa5f1;
  --color-fresh-blue-of-bel-air-500: #008be2;
  --color-fresh-blue-of-bel-air-600: #0876bf;
  --color-fresh-blue-of-bel-air-700: #095e99;
  --color-fresh-blue-of-bel-air-800: #004672;
  --color-fresh-blue-of-bel-air-900: #013050;
  --color-fresh-blue-of-bel-air-950: #001c36;
}

SCSS

$fresh-blue-of-bel-air: #3da0f0;
$fresh-blue-of-bel-air-rgb: 61, 160, 240;
$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);
}