#090060

CSS

:root {
  --alone-in-the-dark: #090060;
  --alone-in-the-dark-rgb: 9 0 96;
  --alone-in-the-dark-oklch: oklch(0.226 0.15 268.8);
}

.element {
  color: var(--alone-in-the-dark);
  background-color: hsl(246 100% 19%);
  border-color: oklch(0.226 0.15 268.8);
}

Tailwind CSS v4

@theme {
  --color-alone-in-the-dark: #090060;
  --color-alone-in-the-dark-50: #e5f4ff;
  --color-alone-in-the-dark-100: #d5e6ff;
  --color-alone-in-the-dark-200: #bcd1ff;
  --color-alone-in-the-dark-300: #9bb3ff;
  --color-alone-in-the-dark-400: #7a99f7;
  --color-alone-in-the-dark-500: #5e7de8;
  --color-alone-in-the-dark-600: #506ac4;
  --color-alone-in-the-dark-700: #3f559d;
  --color-alone-in-the-dark-800: #2b3f76;
  --color-alone-in-the-dark-900: #1d2b53;
  --color-alone-in-the-dark-950: #0d1838;
}

SCSS

$alone-in-the-dark: #090060;
$alone-in-the-dark-rgb: 9, 0, 96;
$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);
}