Fibonacci Blue

CSS

:root {
  --fibonacci-blue: #112358;
  --fibonacci-blue-rgb: 17 35 88;
  --fibonacci-blue-oklch: oklch(0.278 0.099 265.9);
}

.element {
  color: var(--fibonacci-blue);
  background-color: hsl(225 68% 21%);
  border-color: oklch(0.278 0.099 265.9);
}

Tailwind CSS v4

@theme {
  --color-fibonacci-blue: #112358;
  --color-fibonacci-blue-50: #e9f5ff;
  --color-fibonacci-blue-100: #dae8ff;
  --color-fibonacci-blue-200: #c2d4ff;
  --color-fibonacci-blue-300: #a2b6eb;
  --color-fibonacci-blue-400: #839dd9;
  --color-fibonacci-blue-500: #6784c8;
  --color-fibonacci-blue-600: #5870a9;
  --color-fibonacci-blue-700: #465987;
  --color-fibonacci-blue-800: #314265;
  --color-fibonacci-blue-900: #212d47;
  --color-fibonacci-blue-950: #101a2e;
}

SCSS

$fibonacci-blue: #112358;
$fibonacci-blue-rgb: 17, 35, 88;
$fibonacci-blue-light: mix(#fff, $fibonacci-blue, 20%);
$fibonacci-blue-dark: mix(#000, $fibonacci-blue, 20%);

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