American Blue

CSS

:root {
  --american-blue: #3b3b6d;
  --american-blue-rgb: 59 59 109;
  --american-blue-oklch: oklch(0.378 0.084 281.6);
}

.element {
  color: var(--american-blue);
  background-color: hsl(240 30% 33%);
  border-color: oklch(0.378 0.084 281.6);
}

Tailwind CSS v4

@theme {
  --color-american-blue: #3b3b6d;
  --color-american-blue-50: #f1f3ff;
  --color-american-blue-100: #e4e5ff;
  --color-american-blue-200: #cfd0f8;
  --color-american-blue-300: #b1b2e2;
  --color-american-blue-400: #9699cf;
  --color-american-blue-500: #7d7fbd;
  --color-american-blue-600: #6a6c9f;
  --color-american-blue-700: #545680;
  --color-american-blue-800: #3c3f5f;
  --color-american-blue-900: #292b43;
  --color-american-blue-950: #17192b;
}

SCSS

$american-blue: #3b3b6d;
$american-blue-rgb: 59, 59, 109;
$american-blue-light: mix(#fff, $american-blue, 20%);
$american-blue-dark: mix(#000, $american-blue, 20%);

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