#0076BD

CSS

:root {
  --french-blue: #0076bd;
  --french-blue-rgb: 0 118 189;
  --french-blue-oklch: oklch(0.548 0.141 245.8);
}

.element {
  color: var(--french-blue);
  background-color: hsl(203 100% 37%);
  border-color: oklch(0.548 0.141 245.8);
}

Tailwind CSS v4

@theme {
  --color-french-blue: #0076bd;
  --color-french-blue-50: #d6faff;
  --color-french-blue-100: #c3edff;
  --color-french-blue-200: #a4daff;
  --color-french-blue-300: #7bbefc;
  --color-french-blue-400: #4ea5ec;
  --color-french-blue-500: #118cdc;
  --color-french-blue-600: #1577ba;
  --color-french-blue-700: #125f95;
  --color-french-blue-800: #03466f;
  --color-french-blue-900: #04314e;
  --color-french-blue-950: #001c34;
}

SCSS

$french-blue: #0076bd;
$french-blue-rgb: 0, 118, 189;
$french-blue-light: mix(#fff, $french-blue, 20%);
$french-blue-dark: mix(#000, $french-blue, 20%);

.element {
  color: $french-blue;
  box-shadow: 0 0 0 2px rgba($french-blue, 0.35);
}