Mediaeval Blue

CSS

:root {
  --mediaeval-blue: #2e3858;
  --mediaeval-blue-rgb: 46 56 88;
  --mediaeval-blue-oklch: oklch(0.347 0.058 270);
}

.element {
  color: var(--mediaeval-blue);
  background-color: hsl(226 31% 26%);
  border-color: oklch(0.347 0.058 270);
}

Tailwind CSS v4

@theme {
  --color-mediaeval-blue: #2e3858;
  --color-mediaeval-blue-50: #eff5ff;
  --color-mediaeval-blue-100: #e1e7fc;
  --color-mediaeval-blue-200: #cbd3ee;
  --color-mediaeval-blue-300: #adb6d6;
  --color-mediaeval-blue-400: #919dc1;
  --color-mediaeval-blue-500: #7785ad;
  --color-mediaeval-blue-600: #657092;
  --color-mediaeval-blue-700: #515a75;
  --color-mediaeval-blue-800: #3a4257;
  --color-mediaeval-blue-900: #272d3d;
  --color-mediaeval-blue-950: #161a26;
}

SCSS

$mediaeval-blue: #2e3858;
$mediaeval-blue-rgb: 46, 56, 88;
$mediaeval-blue-light: mix(#fff, $mediaeval-blue, 20%);
$mediaeval-blue-dark: mix(#000, $mediaeval-blue, 20%);

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