Biedermeier Blue

CSS

:root {
  --biedermeier-blue: #507ca0;
  --biedermeier-blue-rgb: 80 124 160;
  --biedermeier-blue-oklch: oklch(0.569 0.074 244.3);
}

.element {
  color: var(--biedermeier-blue);
  background-color: hsl(207 33% 47%);
  border-color: oklch(0.569 0.074 244.3);
}

Tailwind CSS v4

@theme {
  --color-biedermeier-blue: #507ca0;
  --color-biedermeier-blue-50: #e5f8ff;
  --color-biedermeier-blue-100: #d5ebff;
  --color-biedermeier-blue-200: #bbd8f3;
  --color-biedermeier-blue-300: #99bcdc;
  --color-biedermeier-blue-400: #79a4c8;
  --color-biedermeier-blue-500: #5a8cb4;
  --color-biedermeier-blue-600: #4d7698;
  --color-biedermeier-blue-700: #3d5f7a;
  --color-biedermeier-blue-800: #2b465a;
  --color-biedermeier-blue-900: #1d303f;
  --color-biedermeier-blue-950: #0d1c28;
}

SCSS

$biedermeier-blue: #507ca0;
$biedermeier-blue-rgb: 80, 124, 160;
$biedermeier-blue-light: mix(#fff, $biedermeier-blue, 20%);
$biedermeier-blue-dark: mix(#000, $biedermeier-blue, 20%);

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