Rurikon Blue

CSS

:root {
  --rurikon-blue: #1b294b;
  --rurikon-blue-rgb: 27 41 75;
  --rurikon-blue-oklch: oklch(0.288 0.065 265.6);
}

.element {
  color: var(--rurikon-blue);
  background-color: hsl(222 47% 20%);
  border-color: oklch(0.288 0.065 265.6);
}

Tailwind CSS v4

@theme {
  --color-rurikon-blue: #1b294b;
  --color-rurikon-blue-50: #edf5ff;
  --color-rurikon-blue-100: #dee8ff;
  --color-rurikon-blue-200: #c8d4f1;
  --color-rurikon-blue-300: #a9b7da;
  --color-rurikon-blue-400: #8c9ec6;
  --color-rurikon-blue-500: #7186b2;
  --color-rurikon-blue-600: #607196;
  --color-rurikon-blue-700: #4d5a79;
  --color-rurikon-blue-800: #374259;
  --color-rurikon-blue-900: #252e3e;
  --color-rurikon-blue-950: #141a28;
}

SCSS

$rurikon-blue: #1b294b;
$rurikon-blue-rgb: 27, 41, 75;
$rurikon-blue-light: mix(#fff, $rurikon-blue, 20%);
$rurikon-blue-dark: mix(#000, $rurikon-blue, 20%);

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