Prussian Blue

CSS

:root {
  --prussian-blue: #003366;
  --prussian-blue-rgb: 0 51 102;
  --prussian-blue-oklch: oklch(0.323 0.103 253.9);
}

.element {
  color: var(--prussian-blue);
  background-color: hsl(210 100% 20%);
  border-color: oklch(0.323 0.103 253.9);
}

Tailwind CSS v4

@theme {
  --color-prussian-blue: #003366;
  --color-prussian-blue-50: #e2f7ff;
  --color-prussian-blue-100: #d2eaff;
  --color-prussian-blue-200: #b8d7ff;
  --color-prussian-blue-300: #95baec;
  --color-prussian-blue-400: #73a2da;
  --color-prussian-blue-500: #5389c9;
  --color-prussian-blue-600: #4774a9;
  --color-prussian-blue-700: #395d88;
  --color-prussian-blue-800: #264465;
  --color-prussian-blue-900: #1a2f47;
  --color-prussian-blue-950: #0a1b2e;
}

SCSS

$prussian-blue: #003366;
$prussian-blue-rgb: 0, 51, 102;
$prussian-blue-light: mix(#fff, $prussian-blue, 20%);
$prussian-blue-dark: mix(#000, $prussian-blue, 20%);

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