Lady of the Night

CSS

:root {
  --lady-of-the-night: #05498b;
  --lady-of-the-night-rgb: 5 73 139;
  --lady-of-the-night-oklch: oklch(0.407 0.126 253.9);
}

.element {
  color: var(--lady-of-the-night);
  background-color: hsl(210 93% 28%);
  border-color: oklch(0.407 0.126 253.9);
}

Tailwind CSS v4

@theme {
  --color-lady-of-the-night: #05498b;
  --color-lady-of-the-night-50: #def8ff;
  --color-lady-of-the-night-100: #cdeaff;
  --color-lady-of-the-night-200: #b1d7ff;
  --color-lady-of-the-night-300: #8dbaf7;
  --color-lady-of-the-night-400: #68a1e7;
  --color-lady-of-the-night-500: #4588d7;
  --color-lady-of-the-night-600: #3b73b5;
  --color-lady-of-the-night-700: #2f5c92;
  --color-lady-of-the-night-800: #1e446c;
  --color-lady-of-the-night-900: #142f4c;
  --color-lady-of-the-night-950: #051b32;
}

SCSS

$lady-of-the-night: #05498b;
$lady-of-the-night-rgb: 5, 73, 139;
$lady-of-the-night-light: mix(#fff, $lady-of-the-night, 20%);
$lady-of-the-night-dark: mix(#000, $lady-of-the-night, 20%);

.element {
  color: $lady-of-the-night;
  box-shadow: 0 0 0 2px rgba($lady-of-the-night, 0.35);
}