Cerulean Blue

CSS

:root {
  --cerulean-blue: #2a52be;
  --cerulean-blue-rgb: 42 82 190;
  --cerulean-blue-oklch: oklch(0.477 0.176 264.9);
}

.element {
  color: var(--cerulean-blue);
  background-color: hsl(224 64% 45%);
  border-color: oklch(0.477 0.176 264.9);
}

Tailwind CSS v4

@theme {
  --color-cerulean-blue: #2a52be;
  --color-cerulean-blue-50: #def5ff;
  --color-cerulean-blue-100: #cde7ff;
  --color-cerulean-blue-200: #b2d2ff;
  --color-cerulean-blue-300: #8fb3ff;
  --color-cerulean-blue-400: #6a99ff;
  --color-cerulean-blue-500: #4b7df9;
  --color-cerulean-blue-600: #406ad2;
  --color-cerulean-blue-700: #3355a9;
  --color-cerulean-blue-800: #203e7e;
  --color-cerulean-blue-900: #152b59;
  --color-cerulean-blue-950: #07183d;
}

SCSS

$cerulean-blue: #2a52be;
$cerulean-blue-rgb: 42, 82, 190;
$cerulean-blue-light: mix(#fff, $cerulean-blue, 20%);
$cerulean-blue-dark: mix(#000, $cerulean-blue, 20%);

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