Rhapsody in Blue

CSS

:root {
  --rhapsody-in-blue: #002244;
  --rhapsody-in-blue-rgb: 0 34 68;
  --rhapsody-in-blue-oklch: oklch(0.251 0.075 251.9);
}

.element {
  color: var(--rhapsody-in-blue);
  background-color: hsl(210 100% 13%);
  border-color: oklch(0.251 0.075 251.9);
}

Tailwind CSS v4

@theme {
  --color-rhapsody-in-blue: #002244;
  --color-rhapsody-in-blue-50: #e7f7ff;
  --color-rhapsody-in-blue-100: #d7eaff;
  --color-rhapsody-in-blue-200: #bfd7f4;
  --color-rhapsody-in-blue-300: #9dbade;
  --color-rhapsody-in-blue-400: #7ea2ca;
  --color-rhapsody-in-blue-500: #6189b7;
  --color-rhapsody-in-blue-600: #52749a;
  --color-rhapsody-in-blue-700: #425d7c;
  --color-rhapsody-in-blue-800: #2e445b;
  --color-rhapsody-in-blue-900: #1f2f40;
  --color-rhapsody-in-blue-950: #0f1c29;
}

SCSS

$rhapsody-in-blue: #002244;
$rhapsody-in-blue-rgb: 0, 34, 68;
$rhapsody-in-blue-light: mix(#fff, $rhapsody-in-blue, 20%);
$rhapsody-in-blue-dark: mix(#000, $rhapsody-in-blue, 20%);

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