Deep Blue

CSS

:root {
  --deep-blue: #040273;
  --deep-blue-rgb: 4 2 115;
  --deep-blue-oklch: oklch(0.255 0.171 265.6);
}

.element {
  color: var(--deep-blue);
  background-color: hsl(241 97% 23%);
  border-color: oklch(0.255 0.171 265.6);
}

Tailwind CSS v4

@theme {
  --color-deep-blue: #040273;
  --color-deep-blue-50: #e0f5ff;
  --color-deep-blue-100: #cfe7ff;
  --color-deep-blue-200: #b4d2ff;
  --color-deep-blue-300: #91b3ff;
  --color-deep-blue-400: #6d99ff;
  --color-deep-blue-500: #4f7df6;
  --color-deep-blue-600: #436acf;
  --color-deep-blue-700: #3555a7;
  --color-deep-blue-800: #223e7d;
  --color-deep-blue-900: #162b58;
  --color-deep-blue-950: #08183c;
}

SCSS

$deep-blue: #040273;
$deep-blue-rgb: 4, 2, 115;
$deep-blue-light: mix(#fff, $deep-blue, 20%);
$deep-blue-dark: mix(#000, $deep-blue, 20%);

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