#000063

CSS

:root {
  --alone-in-the-dark: #000063;
  --alone-in-the-dark-rgb: 0 0 99;
  --alone-in-the-dark-oklch: oklch(0.226 0.157 264.1);
}

.element {
  color: var(--alone-in-the-dark);
  background-color: hsl(240 100% 19%);
  border-color: oklch(0.226 0.157 264.1);
}

Tailwind CSS v4

@theme {
  --color-alone-in-the-dark: #000063;
  --color-alone-in-the-dark-50: #e0f5ff;
  --color-alone-in-the-dark-100: #cfe8ff;
  --color-alone-in-the-dark-200: #b5d3ff;
  --color-alone-in-the-dark-300: #92b5ff;
  --color-alone-in-the-dark-400: #6f9bfa;
  --color-alone-in-the-dark-500: #4f80ed;
  --color-alone-in-the-dark-600: #446cc7;
  --color-alone-in-the-dark-700: #3657a0;
  --color-alone-in-the-dark-800: #234078;
  --color-alone-in-the-dark-900: #172c55;
  --color-alone-in-the-dark-950: #081939;
}

SCSS

$alone-in-the-dark: #000063;
$alone-in-the-dark-rgb: 0, 0, 99;
$alone-in-the-dark-light: mix(#fff, $alone-in-the-dark, 20%);
$alone-in-the-dark-dark: mix(#000, $alone-in-the-dark, 20%);

.element {
  color: $alone-in-the-dark;
  box-shadow: 0 0 0 2px rgba($alone-in-the-dark, 0.35);
}