Queen of the Night

CSS

:root {
  --queen-of-the-night: #295776;
  --queen-of-the-night-rgb: 41 87 118;
  --queen-of-the-night-oklch: oklch(0.439 0.072 240.6);
}

.element {
  color: var(--queen-of-the-night);
  background-color: hsl(204 48% 31%);
  border-color: oklch(0.439 0.072 240.6);
}

Tailwind CSS v4

@theme {
  --color-queen-of-the-night: #295776;
  --color-queen-of-the-night-50: #e4f8ff;
  --color-queen-of-the-night-100: #d4ebff;
  --color-queen-of-the-night-200: #bad9f1;
  --color-queen-of-the-night-300: #98bcda;
  --color-queen-of-the-night-400: #78a4c5;
  --color-queen-of-the-night-500: #588cb1;
  --color-queen-of-the-night-600: #4b7796;
  --color-queen-of-the-night-700: #3c5f78;
  --color-queen-of-the-night-800: #2a4659;
  --color-queen-of-the-night-900: #1c303e;
  --color-queen-of-the-night-950: #0c1d27;
}

SCSS

$queen-of-the-night: #295776;
$queen-of-the-night-rgb: 41, 87, 118;
$queen-of-the-night-light: mix(#fff, $queen-of-the-night, 20%);
$queen-of-the-night-dark: mix(#000, $queen-of-the-night, 20%);

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