US Air Force Blue

CSS

:root {
  --us-air-force-blue: #00308f;
  --us-air-force-blue-rgb: 0 48 143;
  --us-air-force-blue-oklch: oklch(0.355 0.164 262);
}

.element {
  color: var(--us-air-force-blue);
  background-color: hsl(220 100% 28%);
  border-color: oklch(0.355 0.164 262);
}

Tailwind CSS v4

@theme {
  --color-us-air-force-blue: #00308f;
  --color-us-air-force-blue-50: #def6ff;
  --color-us-air-force-blue-100: #cce8ff;
  --color-us-air-force-blue-200: #b1d4ff;
  --color-us-air-force-blue-300: #8cb6ff;
  --color-us-air-force-blue-400: #679cfe;
  --color-us-air-force-blue-500: #4680f1;
  --color-us-air-force-blue-600: #3c6dcb;
  --color-us-air-force-blue-700: #3057a3;
  --color-us-air-force-blue-800: #1d407a;
  --color-us-air-force-blue-900: #132c56;
  --color-us-air-force-blue-950: #05193a;
}

SCSS

$us-air-force-blue: #00308f;
$us-air-force-blue-rgb: 0, 48, 143;
$us-air-force-blue-light: mix(#fff, $us-air-force-blue, 20%);
$us-air-force-blue-dark: mix(#000, $us-air-force-blue, 20%);

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