Tardis Blue

CSS

:root {
  --tardis-blue: #003b6f;
  --tardis-blue-rgb: 0 59 111;
  --tardis-blue-oklch: oklch(0.351 0.105 252.1);
}

.element {
  color: var(--tardis-blue);
  background-color: hsl(208 100% 22%);
  border-color: oklch(0.351 0.105 252.1);
}

Tailwind CSS v4

@theme {
  --color-tardis-blue: #003b6f;
  --color-tardis-blue-50: #e1f8ff;
  --color-tardis-blue-100: #d0ebff;
  --color-tardis-blue-200: #b6d7ff;
  --color-tardis-blue-300: #92bbed;
  --color-tardis-blue-400: #70a2db;
  --color-tardis-blue-500: #4f89ca;
  --color-tardis-blue-600: #4374aa;
  --color-tardis-blue-700: #365d89;
  --color-tardis-blue-800: #244565;
  --color-tardis-blue-900: #182f47;
  --color-tardis-blue-950: #091c2e;
}

SCSS

$tardis-blue: #003b6f;
$tardis-blue-rgb: 0, 59, 111;
$tardis-blue-light: mix(#fff, $tardis-blue, 20%);
$tardis-blue-dark: mix(#000, $tardis-blue, 20%);

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