Gloomy Blue

CSS

:root {
  --gloomy-blue: #3c416a;
  --gloomy-blue-rgb: 60 65 106;
  --gloomy-blue-oklch: oklch(0.39 0.07 277.4);
}

.element {
  color: var(--gloomy-blue);
  background-color: hsl(233 28% 33%);
  border-color: oklch(0.39 0.07 277.4);
}

Tailwind CSS v4

@theme {
  --color-gloomy-blue: #3c416a;
  --color-gloomy-blue-50: #f0f4ff;
  --color-gloomy-blue-100: #e2e6ff;
  --color-gloomy-blue-200: #cdd2f2;
  --color-gloomy-blue-300: #afb4db;
  --color-gloomy-blue-400: #949bc8;
  --color-gloomy-blue-500: #7a82b4;
  --color-gloomy-blue-600: #686e98;
  --color-gloomy-blue-700: #53587a;
  --color-gloomy-blue-800: #3b405b;
  --color-gloomy-blue-900: #292c3f;
  --color-gloomy-blue-950: #171928;
}

SCSS

$gloomy-blue: #3c416a;
$gloomy-blue-rgb: 60, 65, 106;
$gloomy-blue-light: mix(#fff, $gloomy-blue, 20%);
$gloomy-blue-dark: mix(#000, $gloomy-blue, 20%);

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