International Blue

CSS

:root {
  --international-blue: #002fa7;
  --international-blue-rgb: 0 47 167;
  --international-blue-oklch: oklch(0.379 0.195 263.2);
}

.element {
  color: var(--international-blue);
  background-color: hsl(223 100% 33%);
  border-color: oklch(0.379 0.195 263.2);
}

Tailwind CSS v4

@theme {
  --color-international-blue: #002fa7;
  --color-international-blue-50: #daf5ff;
  --color-international-blue-100: #c8e7ff;
  --color-international-blue-200: #acd3ff;
  --color-international-blue-300: #86b3ff;
  --color-international-blue-400: #5f98ff;
  --color-international-blue-500: #3d7bff;
  --color-international-blue-600: #3469dc;
  --color-international-blue-700: #2954b1;
  --color-international-blue-800: #173e85;
  --color-international-blue-900: #0f2b5e;
  --color-international-blue-950: #031740;
}

SCSS

$international-blue: #002fa7;
$international-blue-rgb: 0, 47, 167;
$international-blue-light: mix(#fff, $international-blue, 20%);
$international-blue-dark: mix(#000, $international-blue, 20%);

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